There's ma hen and 6 x 6 week old chicks in a shed aprox 3'x5' and a run the same size twice a day they all get out to free range in the field for 2 - 5 hours a time so I don't think it could be that.
One was particularly badly beaten and it's the largest of the 6, I have removed some loose netting in which perhaps that one got stuck.
I don't know how to tell which is male at this age - the father was a dorking and the mothers any of black rocks, ex-bat gingers, rhode island red or a dorking.