In 1921 it was clear that horse cavalry would no longer be
viable and the Yeomanry could chose between the modern
equivalent with armoured cars or the field artillery.

A vote was taken and the Essex Yeomanry supported the change to
a field artillery. The main though appears to have been the fact
that horses were still required at this time for field artillery
although that was of course to change very quickly.

On 1 November 1921 the Essex Yeomanry were no more and from that
date were known as the 104th ( Essex Yeomanry) Regiment Royal
Horse Artillery.