When president roosevelt said he had "lost the battle, but won the war," what "war" was he referring to?

When President Roosevelt said he had "lost the battle, but won the war," he was referring to his plan to "pack the courts" with judges he endorsed.

The league of nations was found in 1919 to keep peace after world war l.but it failed to prevent world war ll in 1939,so in 1945 the nations of the world set up a new organization,the united state (un).since then, the un has encouraged international cooperation and worked to resolve conflict