1990
- April - 8 UDR mount a clearance operation at the parochial house in Dungannon where a 1,200 lb bomb had been abandoned.
- May - Patrols from 11 UDR provide cover for bomb disposal teams and Royal Engineer search teams on the main Belfast-Dublin railway line at Lurgan. 8 & 11 UDR find explosives totally 1,000 deployed and ready for use.
- 24 July - Brigadier Ritchie & Brigadier Ramsay see a man acting suspiciously on their way to visit 2 UDR on the Armagh-Killyleagh road. Shortly afterwards a bomb is detonated killing three police officers at the same location. Acting on a description provided by the two brigadiers, a patrol from 2 UDR engage in a search, find two AKM rilfes and some rifle magazines and as a result two terrorists are arrested.
Read more about this topic: Timeline Of Ulster Defence Regiment Operations