In 1978 Dessie O'Hare and McGinn killed Thomas Johnston, a former member of the Ulster Defence Regiment (UDR) in Keady, South Armagh.
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In his early service years, he was involved in various operations including tours in Belfast (1978), the Falklands (1982), Crossmaglen (1983), South Armagh (1990), Northern Iraq (1991) and Angola (1992).
Lennon stood unsuccessfully for the National League of the North in South Armagh at the Northern Ireland general election, 1933.
At the Northern Ireland general election, 1933, in addition to supporting most Nationalist Party candidates, the group stood Gerry Lennon in South Armagh.
In April 1985 the Battalion redeployed to Abercorn Barracks, Ballykinler, Northern Ireland and was heavily committed in domestic duties, maintaining law and order, particularly in the terrorist plagued countryside of South Armagh.
Its first use on 19 March 1979 caused the first deliberate victim—a British soldier—from an IRA mortar attack in Newtownhamilton, South Armagh.
The Libyan shipments of weapons for the IRA in the mid-1980s included 18 DShKs 12.7mm machine guns, which further enhanced the anti-aircraft capabilities of the South Armagh Brigade.