Simultaneously with the Danish invasion, Norway's forces were marshaled along the border to force the Swedes to deal with the prospect of fighting a two-front war. A force of 4,000 Norwegians was concentrated at Fredrikshald under the command of General Russenstein, both protecting against any Swedish attempts to invade and threatening to retake the formerly Norwegian province of Bohuslän. The Swedish General Ascheberg took position at Svarteborg with 2,000 men. Operations along the Norwegian-Swedish border during 1675 were largely skirmishes to test strength, as mountain passes were well guarded. Gyldenløve then directed 1000 men in galleys to proceed down the coast and cut off Ascheberg's supply route; as Ascheberg had intelligence of the effort, it was unsuccessful. Both armies went into winter quarters in the border districts.