"War Child" was written by Debbie Harry and Nigel Harrison, who had previously written the hits "One Way or Another" and "Union City Blue" together. The lyrics make reference to war in Cambodia and Middle East. The single was the lowest charting Blondie single to date in the U.K. at the time, peaking at number 39 (all of the band's singles up to that point had reached the Top 20). It was the second and final release from the album, and would therefore be the last (new) Blondie single for some seventeen years, when the band reformed and released "Maria" in 1999.
The B-side to this single was "Little Caesar", also from The Hunter album. The 12" single included an extended remix of the track by producer Mike Chapman, which can be found as a bonus track on EMI's 1994 CD re-issue of the album The Hunter.