Have the pleasure of seeing two enemy planes come down near Vimy. Sent down by our scouts from 10,000 feet up. Enemy balloon breaks loose & comes sailing over our lines.
Severe bombardment all along our new front. I take a trip all along front. Intense bombardment at night. We made ground this morning near & around Lens.
On our right our Naval Div. capture two batteries & many balloons.
*Observation balloons were commonly adopted by all sides and considered ideal in the static trench warfare conditions peculiar to the First World War. Observation readings were passed down via the use of flags or occasionally by radio, and balloon operators would generally remain in the air for hours at a spell. It was regarded as a dangerous job, for although observation balloons were invariably heavily protected by anti-aircraft and machine gun fire and by wire meshes dangled between groups of balloons, they were often the irresistible stationary target of enemy aircraft. (http://www.firstworldwar.com/atoz/balloons.htm)