What examples reflect an action that congress can take under the war power?

Congress can approve or disapprove sending the country to war.

https://www.history.com/topics/vietnam-war/war-powers-act

Congress has the power to take several actions under the war power as granted by the U.S. Constitution. Here are a few examples:

1. Declare War: Congress has the authority to formally declare war against another nation. This requires a joint resolution passed by both the House of Representatives and the Senate, signed by the President, or overriding a presidential veto with a two-thirds majority in both houses.

2. Approve Military Funding: Congress controls the power of the purse and can appropriate funds for military operations. They can allocate money to support the armed forces, purchase equipment, and finance military campaigns.

3. Ratify Treaties: Congress must approve and ratify treaties negotiated by the President, including those related to military alliances, defense agreements, or arms control.

4. Raise and Support the Military: Congress has the ability to raise and maintain the armed forces. They can determine the size of the military, establish recruitment standards, and regulate military training and discipline.

5. Establish Rules of Engagement: Congress can define the rules of engagement for U.S. military forces. This includes specifying when and how force can be used, the scope of military operations, and the limitations on military engagement.

It's important to note that while the President has broad powers as Commander-in-Chief, Congress has a significant role in shaping and controlling military actions by exercising its war powers.