He was a failed military commander pre-PM, even ridiculed after the failed landing at Gallipoli:
https://en.wikipedia.org/wiki/Gallipoli_campaign
Yet we most remember him as a fierce leader from the top, and he did so while under extreme stress due to U-boat attacks strangling shipping to Britain, and puzzlement from the German alien-level advanced technology (V-2 hypersonic ballistic missiles, long-range radio navigation, etc.)
(His scientific advisor told him the above technologies were disinformation, and couldn't be real.)
It's important to realize that while French and British public opinion became soft on the value of their culture and nationhood, Churchill knew better. Just like the pernicious impact of cultural Marxism today in the US, which must be fought as a war on every front.