Paris already broke the truce by not finishing his fight with Menelaus. How is the truce additionally broken?

When Paris is whisked off the battlefield by Aphrodite before the battle is finished, the truce is broken because the fight cannot be completed. Also, when Pandarus, a Trojan archer, shoots an arrow at Menelaus, he is again initiating the battle and breaking the truce. Even though Menelaus is only wounded (the arrow is deflected by Athena), he begins one of the bloodiest battles of the war thus far.