[X] Go to fight the enemy right away. Footmen will have only 3/4 of their HP and spellcasters including Jaina and Arthas will have half mana (rounding up) your troops will also have a small negative modifier to all rolls before the main stages of combat start. However the enemy will be unprepared for you and likely think everything is fine in the area making ambush easier and lowering their defenses greatly.