William Does His Bit is the 23rd book of children's short stories in the Just William series by Richmal Crompton.This book contains 10 stories. It was first published in 1940, and the first published versions are now collectors' items and relatively rare.Like its immediate predecessors and the next two installments this book contains the central theme of World War II and the war effort, which was being fought at the date of this book's original publication.