Eventually, Grace rejoined the Irish Volunteers and was active during the War of Independence where he suffered a gunshot wound to the leg in 1919. Grace was also active in the Anti-Treaty IRA during the Civil War. However, he was unable to carry out an occupation after 1923 and by the 1930s was in poor physical and mental health, spending a period in Grangegorman mental institution in 1944.
Seamus Grace died in May 1959 and is buried in Mount Jerome Cemetery.
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| Surviving Irish Volunteers with Seamus Grace pictured as seated in the middle. © National Library of Ireland |
(MAI, BMH WS 310; MAI, MSPR W1/P/421; MAI, MSPR W1/RB/4467)