Almost from the beginning , the army wanted more range than the 10 cm NbW 35 's 3,000 metres ( 3,300 yd ) .
Troop trials of two prototypes did n't take place until May , 1940 .
Almost from the beginning , the army wanted more range than the 10 cm NbW 35 's 3,000 metres ( 3,300 yd ) , but troop trials of two prototypes did n't take place until May , 1940 .