my boy jack...

"How did you film the battle scenes?
We’d all be sitting there in the rain and mud, chatting to each other before a take and then we’d get up and dash through explosions, which were going off on all sides of us. There were markers dotted across this battlefield where the explosions were and then we’d start filming and they’d take them away and start the rain machines, so our vision would be reduced by about 70 per cent."