By 29 December 1914, German troops dug in on higher ground to the east of Ypres and consequently, the Ypres Salient was formed by British, French, Canadian and Belgian defensive efforts against German incursion during the 1914 Race to the Sea. This culminated in the Battle of the Yser and the First Battle of Ypres, which lasted until 22 November. German and British units conducted operations, made advancements, captured territory and attacked using mines and underground warfare at locations like Broodseinde and Sint Elooi.