He died in the campaign to relieve Mafeking during the Second Boer War. Born in Farnborough, Hampshire, England, Milligan was a talented all-rounder, he bowled at a lively pace, fielded well and went for his strokes with the battalion He excelled for the Gentlemen v Players at The Oval in 1897, scoring 47 in each innings, and snaring two wickets for three runs in the Players" second innings.
While at North Marine Road Ground, Scarborough a year later, he took seven second innings wickets for 61.
Milligan played his two Test matches on Lord Hawke"s tour of South Africa in 1898/9. He stayed on in South Africa after the tour, and served under Colonel Plummer in the Second Boer War, rising to the rank of Lieutenant at the time of his death in action in Ramathlabama, South Africa, at the age of 30.
A memorial window to him, as well as a memorial brass, were dedicated to him in Street Mark"s church, Low Moor (which is now a private house). There is a memorial sundial to Frank Milligan in the rose garden of Harold Park, Bradford, West Yorkshire.