the.com/collateral damage

means Unintended harm to people or things not meant to be targeted, especially the civilian casualties of a military action.

from A 20th-century military-strategy term built from 'collateral' (Latin con- 'together' + latus 'side,' meaning something running alongside the main line, secondary) plus 'damage.' It entered defense jargon in the mid-1900s to describe incidental destruction near an intended target, and gained wide public currency during the Vietnam and later Gulf War eras, when it crept into press briefings as a bloodless way to describe dead civilians — a shift critics have long pointed to as language doing the work of distance.