Can someone be charged with assault if he wasn't the aggressor and was just acting in self-defense?

Question Details: The evening of the incident there was arguing then the victim hit the defendant with a beer bottle. The defendant got up shoved said victim before she hit him upside the head with the other beer bottle. When he pushed her, her Chihuahua was behind her. She tripped and fell over the dog and hit her head on a glass table. A week later she went to the hospital with blood around her brain. The Nuro surgeon Told her father that the fall wouldn't cause this. The defendant is charged with aggravated assault SBI. She did not call the detective or press charges. Her dad did claiming he was the victim and the witness. No one was there aside from her dog and her son upstairs sleeping. Can he be convicted for assault if he was just defending himself to get away from being hit again with a glass bottle?

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