With the outbreak of First World War, Catcheside served in the British Army where posted to the Royal Field Artillery, reaching the rank of second-lieutenant. He served his country again in the Second World War, once more in the Royal Field Artillery, where he was lieutenant-colonel.
Catcheside's military service began with the outbreak of World War I, where he joined the British Army and rose to the rank of second-lieutenant in the Royal Field Artillery. He later served again during World War II, also within the Royal Field Artillery, achieving the rank of lieutenant-colonel.