His determination to get photographs was only equalled by the eagerness of the Huns to prevent him, their scouts diving on him again and again, firing incendiary as well as ordinary bullets. (Often represented as being contrary to various Hague Conventions - which outlawed expanding bullets - their use was reckoned to be a cad's trick, and there were pilots, Mannock among them, who wouldn't use them, but both sides did.)

The Pomeroy Bullet was an explosive machine gun bullet deployed specifically for use against the Zeppelin threat over Britain. The incendiary bullet, developed by New Zealand engineer John Pomeroy (1873-1950) in 1902, was quickly adopted by British defence services as a means of combating the growing German Zeppelin threat in the skies above Britain.

Filled with nitro-glycerine the bullet ignited the hydrogen gas which escaped from the tear in the Zeppelin gas bag created by the bullet's passage. The bullet's effectiveness led to a marked decrease in the number of Zeppelin attacks.

In 1867 he patented the product, calling it dynamite.