 Complete the following phrase:  In February 1941, Skylark B reported on German ships in Trøndelag, and on export of iron ore from Narvik. In March, there were telegrams on pyrite shipments from Thamshavn, on large numbers of German troops in Mosjøen, on a seaplane base in Hommelvik, and on German gas ships in Trondheim. During spring 1941, telegrams reported high military activity German troop movements which later appeared to reflect preparations for the German 