It's actually a pile of poo : one of the Hopilites is a bit of a lad and he chose to break off a loaf right there before the battle saying something like "well this is what I think" .
Anyhow , it so turned out to be the mother of all arse biscuits , and the rest of the lads couldn't help but be amazed and deeply impressed . They are merely staring at the leavings in stunned silence in that shot , given they have never seen anyone drop a pile of off brownie even remotely that large in one squating before .

That's how realistic the attention to detail is in RTW , C/A out did its' self there !