Nor were the U-boats the only threat. Following some early experience in support of the war at sea during Operation Weserübung, the "Luftwaffe" began to take a toll of merchant ships. Martin Harlinghausen and his recently established command— "Fliegerführer Atlantik"—contributed small numbers of aircraft to the Battle of the Atlantic from 1941 onwards. These were primarily Fw 200 Condors and (later) Junkers Ju 290s, used for long-range reconnaissance. The Condors also bombed convoys that were beyond land-based fighter cover and thus defenceless. Initially, the Condors were very successful, claiming 365,000 tons of shipping in early 1941. These aircraft were few in number, however, and directly under "Luftwaffe" control; in addition, the pilots had little specialised training for anti-shipping warfare, limiting their effectiveness.