Dawid was trained in the military arts and discipline at an early age in which he later took his place as one of the primary advisors to both of his brothers and his son, the last of the three patriarchs from the d’Mar Shimun succession.

[5] On October 22, 1916 The Russian Palkonik (Colonel) Kondriatoff gave orders to Dawid to send a battalion of a thousand to Gawar for the destruction of the Valley of Hark.

Rab trimma (commander of 200) Daniel of Malik Ismail and Rayis (chief) Boko Oshana of Asheeta attacked.

[6] Suto agha of the Kurdish Oramar tribe actively participated in the mass slaughter of Assyrian Christians in the region,[7] the Assyrians retaliated against Suto and, in early September 1917, he was besieged at Oramar by an army led by Agha Petros whilst an army led by Dawid attacked from another direction, killing 16 and capturing 30 Kurds, and suffered one death and two wounded.

[8] On 16 March 1918 he participated in the Battle of Charah in an attempt to avenge his brother Mar Benyamin Shimun after he was assassinated by Simko Shikak.

After the surrender of thousands Turkish prisoners on 12 of September 1918 1,500 Assyrian fighting under the command of Dawid joined the British in the city of Hamadan.

In 1920 several dispatches were signed by Winston Churchill, In 1925, Dawid was promoted to the rank of Rab Khaila (Commander/Force Leader) for the Assyrian Levies, in their vital but overlooked role supporting the Allies.