 Otway launched the assault as soon as the first glider overshot the battery , ordering the explosives to be detonated to form two paths through the outer perimeter through which the paratroopers attacked . The defenders were alerted by the explosions , and opened fire , inflicting heavy casualties ; only four attackers survived to reach Casemate Four , which they disabled by firing into apertures and throwing grenades into air vents . The other casemates were cleared with fragmentation and white phosphorus grenades , as the crews had neglected to lock the doors leading into the battery . During the bombing raid , the battery 's guns had been moved inside the casemates and the steel doors left open for ventilation . During the battle , 22 Germans were killed and a similar number made prisoners of war . The rest of the garrison escaped undetected by hiding in the underground bunkers . 
 Otway launched the assault as soon as the first glider <a href='uninflect' title='1'><mark>overshot</mark></a> the battery , ordering the explosives to be detonated to form two paths through the outer perimeter through which the paratroopers attacked . The defenders <a href='uninflect' title='2'><mark>were</mark></a> alerted by the explosions , and opened fire , inflicting heavy casualties ; only four attackers survived to reach Casemate Four , which they disabled by firing into apertures and throwing grenades into air vents . The other casemates <a href='uninflect' title='3'><mark>were</mark></a> cleared with fragmentation and white phosphorus grenades , as the crews <a href='been_done' title='4'><mark>had</mark></a> neglected to lock the doors leading into the battery . During the bombing raid , the battery <a href='null_genetive' title='5'><mark>'s</mark></a>guns <a href='been_done' title='6'><mark>had</mark></a> been moved inside the casemates and the steel doors left open for ventilation . During the battle , 22 Germans <a href='uninflect' title='7'><mark>were</mark></a> killed and a similar number made prisoners of war . The rest of the garrison escaped undetected by hiding in the underground bunkers . 
Otway launched da assault as soon as the first glider overshoot the battery , ordering the explosives to be detonated to form 2 paths thru the outer perimeter through which the paratroopers attacked . Tdadefenders was alerted by the explosions , and opened fire , inflicting heavy casualties ; only four attackers survived to reach Casemate Four , which they disabled by firing into apertures and throwing grenades into air vents . The other casemates was cleared with fragmentation and white phosphorus grenades , as the crews done neglected to lock the doors leading into the battery . durin the bombing raid , the battery  guns done been moved inside the casemates and the steel doors left open for ventilation . During the battle , 22 Germans was killed and a similar number made prisoners of war . The rest of the garrison escaped undetected by hiding in the underground bunkers .