What did Neville Chamberlain do in the 1st world war?

The phrasing of the question is biased. 1. Despite his dithering in the first two days of September 1939, he did actually declare war on Germany on 3 September. This turned what would otherwise have been a minor, local war into something much bigger. 2. He resigned quickly in May 1940. 3. He died in November 1940. It was Chamberlain, who as Chancellor of the Exchequer from 1931-37, had taken the unpopular step of raising taxes in order to finance Britain's rearmament. Even Churchill expressed gratitude for this.