How does the central idea of the purpose of military campaigns
intersect with the issue of resistance and surrender in this passage

It supports the main point that this is an ongoing fight that America will not abandon

Explanation:

From the speech of President George Bush to the American troops on the USS Abraham Lincoln, he made it clear that while the American troops have made in-roads in the battle against terrorism namely Al-Qaeda and wounded them, they were yet to be utterly defeated.

He encouraged them to be steadfast as they were winning the war against terrorism and that no acts of the terrorists can "weaken our resolve" or "alter their fate".

The sentence "Free nations will press on to victory" relates to the central idea of the speech by supporting the main point that this is an ongoing fight that America will not abandon.