This interests me greatly...makes me think of scenarios and stuff.
How were they planning on replacing the detonated or cleared mines? Slip Visbys in and kick them off the back? Task aircraft with re-laying in a pre-planned pattern? How were they planning on keeping the assets close enough to take advantage of windows in the enemies surveillance? I'd try to look it up myself, but I don't trust any alphabet that has bull's eyes over the letter "A" (also I don't speak Swedish).
Specifically, this is for harbor defense, with the Swedish archipelagos during the cold war.
They were planning on using boats, or possibly rails to get more mines out of storage blown into the sides of the mined inlets.
Swedish Coastal Artillery was organized into Brigades which covered specific geographic areas, and contained a mixture of
1) Spärrbataljoner (Blocking Battalions) which were relatively immobile and blocked off access to ports/coast - each brigade contained at least one and usually more than one, depending on what their area contained, and consisted of:
1.1) Heavy Fixed coastal artillery batteries - f.ex.
ERSTA, and predecessors.
1.2) Light fixed coastal artillery batteries - older guns, mostly with lighter firepower, closer to the coast/harbor.
1.3) Minspärrtropp (Mine Blocking Troops), which controlled sea mines in the approaches/inlets.
2) Mobile forces, primarily
2.1) Kustjägarkompanier (if you played Wargame: ALB, you know what this is).
2.2) Robotbatterier (AShM batteries) - well, okay, these mostly fielded heavy ATGM in the cold war - RBS 52 was the French SS.11M, but later real AShM in the form of the RBS 15KA (Swedish AShM) and more potent ATGM's in the form of RBS 17 (Hellfire SDS) were fielded (just before the Coastal Artillery was disbanded, as a matter of fact).
2.3) Mobile artillery batteries - these included older mobile artillery pieces, plus AA guns to cover them.
Additionally, the brigades also had some battalions from the Army, primarily a bicycle infantry battalion as a mobile reserve, a home guard battalion and several local defense units, which would include defense guns and turrets. Such units were composed according to their assigned mission and, as such, had no fixed organisation. They usually were formed up as the crew of a defense gun (which was an older artillery, naval or AA gun covering a specific objective) or defense turret (a turret from an obsolete tank, fixed on top of a bunker), plus some additional infantry to cover it. Just about every important harbor and airfield, and several other pieces of critical infrastructure in Sweden, had such a unit assigned.
Aside from that, the Coastal Artillery also fielded mobile artillery battalions, most notably (from the 1980s) equipped with the Coastal Artillery version of the FH77 - 12/80 "KARIN" (a FH 77 bored only to 120 mm), which had a high rate of fire, and which was being motorized/mechanized when the Coastal Artillery was disbanded, the prototype for the "KARELIN" served as an inspirational testbed of what eventually became the Archer artillery system.
There were also Amphibious Battalions with Kustjägare, which were where the RBS 17 ended up - one amphibious battalion survived when the Coastal Artillery was disbanded and is now AmfBat, still with RBS 17.
As an example of a blocking battalion, the
Femöre battery which was part of the battalion covering
Oxelösund harbor is preserved as a museum - it's a light battery (one of two, later three, in its battalion), with three 75 mm guns with a range of 13 km. The battalion it was part of would also include a missile battery. As it was a fairly low priority area, it had no mining troops (mining by minelayer would still be done, of course).
In contrast, the Naval base of
Muskö was surrounded by blocking battalions with mining troops - all part of KAB 3 (Coastal Artillery Brigade 3) with staff on
Järflotta, which also covered the area south of Stockholm -
Ornö,
Mellsten,
Askö housed blocking battalion staffs (Askö technically on
Torö) with heavy and light coastal artillery batteries (including a 12/70 ERSTA battery on
Landsort) and between them had six mine blocking troops (two Ornö, three Mellsten, one Askö). Additionally, the brigade had a defense area group staff type B, three bicycle infantry battalions, an engineer company, logistics company, and a number of defense companies all from the army.
Heavy batteries in general had two to four 12 cm guns (though, it varied depending on type) with ranges of about 20 km, ERSTA batteries had three guns with 25-37 km range depending on ammo, light batteries had 75 mm guns with 10+ km range, missile batteries were RBS 52 with 3 km range (wire guided), or RBS 17 with 7 km range (laser guided).
Aside from KAB 3, KAB 1 and 2 were also in the Stockholm area (north and east approaches respectively), as well the 2. KA battalion 12/80 (8 guns). Three amphibious battalions were also part of the organization.
In the Stockholm area was also the 3. Mobile Blocking Battalion which had a battery of three 75 mm m/65 guns (10 km range) - which had such a short range, they had an armored booth you could put on the gun after deploying to protect the crew, and had to be deployed on the beach/coast they were defending - a light robot battery and a mine blocking troop.
N.B. All that is the 1984 organization.
It's certainly not capable of contesting the ocean, but try sending troopships to unload in the harbor!
(That said, air defenses were... Mostly 20 and 40 mm autocannons, a few RBS 69 and 70, maybe RBS 77 and whatever air units were available - take the time to suppress the defenses thoroughly and you can probably get into the harbor unmolested, but by then the Swedish army will have mobilized.)
