A jury is set to begin deliberating this afternoon in the case of a man accused of allegedly assaulting another man during a dispute over an ex-girlfriend.

Dean Law is on trial in the ACT Supreme Court, having pleaded not guilty to recklessly inflicting grievous bodily harm.

The Crown closed its case on the second day of the trial, saying the level of force used by Law had been excessive.

But the accused man's barrister argued his client had acted in self-defence.

Law and the alleged victim were both former lovers of the woman.

The court heard Law went to a home in Wanniassa on December 14 last year to speak with the woman who only three weeks earlier had ended their romance.

The woman instructed Law to leave and went to re-enter the home via the front door and backyard but he blocked and grabbed her.

The court heard the complainant came to the aid of the woman armed with a metal pole.

The two men fought and Law ended up pinning the alleged victim to the ground, repeatedly punching him in the head.

The woman attempted to intervene before Law stood up and left in his car.

Both legal teams this morning tended images of the injuries sustained by the men during the altercation.

Justin John Burns will give jurors final directions before sending them out to deliberate.