bombardment

(electronics) The use of induction heating to heat electrodes of electron tubes to drive out gases during evacuation.

noun

A concentrated outpouring, as of missiles, words, or blows: barrage, burst, cannonade, fusillade, hail, salvo, shower, storm, volley. See attack/defend.

Massive attack from the air, sea, or land by explosive munitions, particularly in sieges or against field fortifications. Bombardment by cannon first became effective against walls in the 1450s. Famous modern artillery bombardments include those of Port Arthur in 1904-5, Liège by the Germans in July 1914, and Sevastopol in 1941-2. The ‘preparatory bombardments’ and ‘counter-bombardments’ of WW I sometimes made the land to be advanced over virtually impassable. Mass air and land bombardments became common during WW II and became a signature of Soviet tactics. Journalists sometimes use the word to describe merely sporadic shelling. Those who have experienced the real thing do not.

— Jonathan B. A. Bailey

The noun has 3 meanings:

Meaning #1: the act (or an instance) of subjecting a body or substance to the impact of high-energy particles (as electrons or alpha rays)

Meaning #2: the heavy fire of artillery to saturate an area rather than hit a specific target
  Synonyms: barrage, barrage fire, battery, shelling

Meaning #3: an attack by dropping bombs
  Synonym: bombing