Final answer:
Achilles and Ajax were the two great champions on the Greek side when Achilles was out of the battle.
Step-by-step explanation:
The two great champions on the Greek side when Achilles was out of the battle were Achilles and Ajax. Both Achilles and Ajax were Greek heroes who participated in the Trojan War.
Achilles was considered one of the greatest heroes, while Ajax, although a close friend of Achilles, had a more complicated fate.