The British corps in World War I included 23 infantry corps and a few mounted corps .
When the British Army was expanded from an expeditionary force in the First World War , corps were created to manage the large numbers of divisions .
The British corps in First World War     included 23 infantry corps and a few mounted corps .
When the British Army was expanded from an expeditionary force in the First World War , corps were created to manage the large numbers of divisions .