121st Pioneers

Chronology

1777 raised as the Marine Battalion
1818 became the 1st (Marine) Battalion, 11th Regiment of Bombay Native Infantry
1824 became The Marine Battalion, Bombay Native Infantry
1861 became the 21st Regiment of Bombay Native Infantry (The Marine Battalion)
1885 became the 21st Regiment of Bombay Infantry (The Marine Battalion)
1901 became the 21st Bombay Infantry (The Marine Battalion)
1903 became 121st Pioneers
1922 became 10th (Marine)/2nd Bombay Pioneers
1929 became The Corps of Bombay Pioneers
1933 disbanded

121st Pioneers Wikipedia
121st Pioneers British Empire website