A Medical Officer's flag of the Royal Naval Division, Hawke Battalion. The flag is made of machine-sewn, wool bunting stencilled with the letters 'M.O.' in oil based paint. The crest and motto of the Hawke Battalion 'STRIKE' is applied to the centre of the blue flag; the details of this badge are printed. Badge: a hawk rising ermine gold, charged on the breast with a fleur-de-lis also gold. The hoist has been made by turning over and sewing the edge of the flag.

The flag was used by Surgeon Lieutenant Charles Edward Leake on the Western Front during World War One. The Royal Naval Division moved to France in May 1916, and by this time it included few naval personnel. It transferred to Army control in the following month and became known as the 63rd (Royal Naval) Division. It was demobilised in France in April 1919.

Leake was posted to the Hawke battalion on 22 May 1918. He was awarded the Military Cross on 15 October 1918. The London Gazette noted that 'he was with the battn. during six days' incessant fighting, and displayed untiring devotion to duty dressing the wounded under constant fire. His gallantry and coolness were a splendid example, and inspired the stretcher-bearers under his command to great efforts to evacuate all the wounded, which was accomplished with admirable care. He received a bar to the Cross for services during the operations of 27 to 29 September 1918. He displayed admirable coolness under heavy fire, and succeeded in establishing his regimental aid-post in the most advanced positions, where he attended the wounded of all battalions.' (London Gazette, 10 December 1919 p.15302; London Gazette, 1 January 1919, p. 629).