Military exercises included capturing and holding airborne bridgeheads, road or rail bridges and coastal fortifications. The VVS was in constant action against German bridgeheads on airfields. The infantry established defensive positions in bridgeheads spanning the front. The New Zealand Mounted Rifles Brigade advanced across the river and established two bridgeheads. Then the offensive against East Prussia was to begin from these bridgeheads. The few Russian bridgeheads on the west bank were invested. The Sedan bridgeheads were still not safe. By the end of the day the division had captured bridgeheads. From then until November, it fought in the battle for the Narew bridgeheads. But the first attempt to establish bridgeheads failed. Operation "Badr" called for an enlargement of the bridgeheads on October 8. On 20 May, five days after consolidating their bridgeheads, the German Army reached the Channel. Without it, the bridgeheads would not stand for long. German bridgeheads across the Dyle were either eliminated or contained by British counter-attacks. These bridgeheads in retrospect presented a serious threat to Army Group B.