Strict heraldic regimentation dictated what was painted on the shield, and often it had a lot to do with honors bestowed upon a nobleman's family. Body parts on a heraldic crest are not uncommon however a woman's breast is unique to our clan. In 1306 AD, Edward I granted a heraldic crest to Peter Dodge of Stopworth, Cheshire. At that time in history, the king was engaged in a struggle with Scotland. And wealthy squires who supplied the king with horses, cattle and foodstuff were sometimes rewarded in the same way.
History always rewards tactics at the expense of logistics in any significant military campaign.
The real hero of that famous battle was a nobleman named Robert of Montgomery. Sir Robert organized the transfer of the army and supplies across the English Channel. Without this clever logistician, there would not have been a Norman England. Likewise had it not been for the logisticians, there would not have been a conquest of the Scots. Edward I probably rewarded his benefactors with heraldic crests as may have been the case with Peter Dodge.