I'm not very knowledgeable about lore, was this a reference to how that one Ludenhof send all the civilians against beastmen so they won't eat up the resources? I hope despite everything, things won't get that bad in Ostland because I can certainly see Anna pulling a similar trick.
It's a bit more than that, though that did happen.
In the history of the lore of the Empire, and a few of the factions in and around it, there are a few particular standouts for being responsible for causing absolutely horrendous immense destruction to the Empire itself. Basically, 'the times the bad guys did really good' as it were. Beyond the Vampire Wars, the three separate campaigns by the Von Carsteins to consume the Empire from within and wrest control over it entirely for the Midnight Aristocracy. Another one known of and respected and feared in the distant past would also be Gorbad Ironclaw. Even in the canon where it is acknowledged that yes yes Grimgor is 'da biggest and da baddest' and all that, he is also just straight up not the worst threat - at least until End Times I guess where killing an Overtyrant makes him soooooo cool and tough that they call him the avatar of the Great Maw or whatever the heck that was about. This can be seen by him getting so bored easily, attacking his own people if he can't fight literally once every 24 hours, and how he stood around battling one guy and didn't notice how basically his entire WAAAAAGH!! died around him against Crom, was repeatedly rebuffed by Katarin of the 2520s sending blizzards at his face to prevent him from even reaching the city, etc. Gorbad Ironclaw was the actual worse threat to the Empire, centuries before, because he was clever enough and strong enough, maybe not enough to beat Grimgor in a duel, but in terms of effectiveness, way better. Gorbad razed Solland so bad it never came back, and nearly managed the same to Wissenland.
Gorthor the Cruel was the greatest leader the beastmen ever had in the Empire's history, and came about when a great number of the Empire's troops were off fighting in the Crusades in Araby.
He was the one Beastlord who was so tough, so strong, so blessed by the Dark Gods, that none have matched him since. Not even One-Eye from canon, technically, because Gorthor was so blessed that a straight up aura of Chaos power would form around him when he fought as a sign of the Dark God's favor. Also, he was specifically noted to be possessed of vision, and the will to 'sear it into the minds of his followers'. He gathered basically all the beastmen of the Empire at the time and sent them at Ostland, practically shattered the province to pieces. He was so bad they straight up thought he wasn't even a beastman, but a daemon. Broke towns, armies, castles, etc. and devastated the province utterly.
Then ran into a huge Black Orc WAAAAGH!! and killed them too. When he started marching to Hochland, Ostland tried to send what meager reinforcements they could muster, and Gorthor got a vision from the Dark Gods about it so he turned around and stomped them flat to leave his flank clear.
Then he headed towards Hergig. They were ever stronger, ever more numerous, ever more blessed by the Dark Gods, and seemed to stretch across the horizon.
Now, Mikael Ludendorf, the Count of Hochland at the Time, was not well-loved. Or loved at all. He was ruthless, cold, and feared by his own men and people. His elite troops were all in Araby. No good infantry, no heavy cavalry. Zero chance of contesting the beastmen on the open field.
So, what did Mikael Ludendorf do, knowing this?
First, he ignored the pleading of his people to save them and the countryside of Hochland from the beastmen, and instead focused everything he had solely upon the defenses of Hergig itself.
Second, he broke his troops into mounted pistoliers and outriders to fight a running rear guard battle to hold back the enemy from reaching Hergig as long as possible, and the rest into defense preparation workers. The good people of Hergig were forced into hard labor, with little sleep or food, to do so. Many died of exhaustion outright. Others who tried to flee were caught and executed as traitors. I'm actually not entirely sure where I read this, I'm like 65% sure I really did, but he also appears to have shanghaied a group of dwarfs, basically enslaved them to work in his foundries and workshops to produce weapons/armor/cannons, and got a Grudge levied against him as a result of doing it.
Third, he burned the forests around Hergig to create open killing grounds for his ranged troops, filled the entire area beyond in the trees with snares and traps, poisoned every well outside the walls he could reach, brought in all livestock that could be and slaughtered them for meat and supplies if they could not be sheltered or were not meant for it, and had the cookpots, plowshares, and even the bells of the shrines melted down to make even more weapons.
It took three weeks or so for Gorthor to finally get past all those defenses, and their intolerable progress had been slowed enough that the beastmen and the Beastlord had gotten frustrated with their slowed pace, and up to the walls. Another twenty two days after beginning the siege that they broke through the gates and got into the city, only after Gorthor invigorated the horde by proclaiming they could feast upon the whole populace of Hergig and he'd only take Mikael Ludendorf's head himself to eat.
Instead of paraphrasing the rest, I'm just going to straight up use the Armybook's section that the Wiki sources from:
The Burning of Hergig said:
The horde of Beastmen poured into the city after them as a flood breaching a dam. The braying herds sought out the defenders wherever they were to be found, making little or no distinction between soldiers and citizens. In no time at all, many of the buildings within the walls were ablaze and the fighting boiled down to a series of savage, running battles in which individual townhouses became bastions and open streets became killing grounds.
Slavering Chaos Warhounds fought Imperial hunting dogs, and Harpies engaged in bitter aerial melee against noble hunting birds and elite Griffon riders. The air soon became full of terrifying shrieks and cries as hawks, eagles, falcons and Griffons snapped and ripped the flesh of their hideous foes. Far below, resistance collapsed before the terrifying stampede of the Minotaurs. The Empire Greatswords of Hochland were the only warriors with the courage to face them. A handful of Minotaurs were hamstrung by the warriors' double-handed blades, before their skulls were split in turn by the gigantic greataxes of the bull-headed creatures.
Tuskgor Chariots rode down the brave but perhaps foolish Imperial spearmen who stood resolute before them. Masses of Gors overran the entrenched war engines of the city and butchered the crews, even though hundreds of Beastmen were blasted apart or mowed down in the process. Hochland marksmen shot at the Beastmen leaders from hidden windows high above the streets, but Harpies pulled them from their hideaways and tore them apart. Priests of Ulric and Sigmar tried to outdo each other by attacking the Beastmen with ever-greater displays of holy wrath and Divine Magic, but the Bray-Shamans rallied the warherds with their own mastery of the Lore of the Wild and drove them ever onwards.
For three days and three nights the battle raged on, with no quarter being asked for, or given. In the end, the Beastmen finally drove most of the defenders out of the city's south gate, and slaughtered those who remained. They were victorious but their casualties were horrendous. At least half of the horde was either dead or seriously wounded. Most of their chariots were crushed by stones thrown from the walls or broken in the savage street battles.
With only a handful of troops left, Count Mikael withdrew to his palace. He ordered the archers on the walls to shoot with flaming arrows, and soon every building not already set ablaze by the Beastmen was burning at the hands of the defenders. Hundreds of Beastmen, along with many civilians hiding in cellars and attics, were roasted alive. The Elector Count appeared not to care -- there was no place in his city for those who would not fight.
When his chief councillor suggested surrender, Mikael flew into a rage. He sent the man to Gorthor, saying that he was more a Beastman than a true son of Hochland. Gorthor offered the man freedom if he betrayed his lord and let the Beastmen into the palace. The councillor, loyal to his liege lord to the last, refused and was eaten alive by Gorthor himself.
It was only then that reinforcements arrived, in the shape of hundreds of elite veteran Knights of the Blazing Sun charging into the beastmen from behind. Gorthor's horde was finally wavering, on the lip of breaking, and so Mikael Ludenhof charged out of his palace, basically the only standing structure left in the entire city of Hergig, and the fighting intensified further still. Eventually, knowing he needed to strike down the final lynchpin of the resistance so he could try and reorient on the furious knights tearing his horde to pieces, he went for Ludenhof who was dressed in his and I quote 'resplendent ancestral plate', demanded he face him in a duel, and for some insane reason Ludenhof agreed despite his remaining captains protesting otherwise.
You know, because Warhammer.
Anyway, again, the sourcebook describes this just fine:
The Death of Two Monsters said:
For almost an hour the two fought on the great palace steps. Both the enemy armies paused, near-exhaustion, waiting for the outcome of the duel -- the Beastmen braying and barking with bloodlust, the Men silent, anxious and desperate. It seemed that the Elector Count would surely fall before the fury of the gigantic Beastlord, yet time and again he somehow parried Gorthor's incessant attacks. Then Gorthor struck such a heavy blow that the count's shield was splintered and his ancient plate armour rent in two. Gorthor's spear pierced Mikael Ludendorf's body, the Beastlord putting all of his strength into lifting the spear high into the air even as the transfixed Mikael slid down its length. At the very instant of Gorthor's victory, the Elector Count's Runefang, his magic sword of office, swept around almost of its own accord and plunged itself into Gorthor's chest. It seemed that the blessed blade hungrily drank the blood of the monstrous Beastman. Gorthor the Beastlord and Count Mikael Ludendorf of Hochland died together in that instant, each the equal of the other in the judgement of the gods they served.
Beastmen collapse, fall back, retreat, and no one is charismatic or powerful enough to be Gorthor's equal amongst them.
Hochland's troops are too exhausted to chase them.
Whole massive swathes of Hochland and Ostland become lost to the wilderness, never to be reclaimed and solely the territory of beastmen amongst overgrown ruins of Imperial settlements.
Mikael Ludenhof was a cold bastard, monstrous even to his own people, but in the end through his actions he ensured that while Gorthor would reach Hergig he would go no further anywhere else and his grand vision of apocalypse and every human settlement ever a burning ruin would not come to pass.
That was the guy that Anna was reading up on.