На своей улочке храбра и курочка

Every man is brave when he is in his own place, among his friends and supporters. See На своем пепелище и курица бьет (H), У своего гнезда и ворон бьет орла (У)

Cf:

A cock is /always/ bold on his own dunghill (Br.). A cock is mighty in his backyard (Am.). A cock is valiant on his own dunghill (Br.). A dog is bold n his own dunghill (Br.). A dog is brave in his own yard (Am.). Every dog is a lion at home (Am., Br.). Every dog is brave in his own yard (Am.). Every dog is valiant at his own door (Am., Br.). A man is a lion in his own house (Am.)