oil painting on canvas

I am writing this with hope that someone can verify the artist's name and date period for a oil painting that belonged to my great grandmother. It hung in her dining room when I was a child in mid 50's and early 60's until she died and I have had it for at least 45 years. The painting is of 2 Latinos getting ready to fight their roosters or at least set them free in front of a deserted Mexican adobe building. My cousin remembered the painting and told me the artist could be Augustus W. Dunbier.

Poor