He started a counterattack against the opponent to retaliate.

He did his best to give tit for tat.

If you are the other person, I feel relieved.

They were subjected to the enemy's counterattack.

They started a counteroffensive against the enemy's attack.

We celebrated the start of a new project.

We started a new project.

He was rewarded by the company for his hard work.

He shot one arrow.

He is my best friend.