I have nothing to offer but blood, toil, tears, and sweat. We have before us an ordeal of the most grievous kind. We have before us many, many months of struggle and suffering. You ask, what is our policy? I say it is to wage war by land, sea, and air. War with all our might and with all the strength God has given us, and to wage war against a monstrous tyranny never surpassed in the dark and lamentable catalogue of human crime. That is our policy.
What main idea is Churchill trying to express in this passage? He does not have the supplies he needs to wage war. The war will be long and challenging, but Britain will continue to fight. Hitler has been committing crimes against humanity. The naval defenses are more important than those on land.

Churchill was the first to point to Hitler's threat.

Explanation:

Even before the outbreak of World War II, British Prime Minister Winston Churchill pointed to the danger lurking in Germany. In this passage, Churchill said that the war would be long and complicated and that it would be fought in all possible ways. Britain did not have enough capacity to confront the hitter itself, so Churchill warned the world about the threat coming from Germany. America provided some assistance to Britain in arms during the war. Churchill presented to Britain and the world the fact that the war would be long, complicated and destructive because he was familiar with belligerent nationalism in Germany and the fact that Germany was at that moment the most powerful military force in the world.