He exchanged from the 17th Regiment to the
24th Regiment of Foot in 1848. Later that year, he commanded a brigade in the Second Anglo-Sikh War, composed of the 24th Regiment and Bengal Native infantry battalions, in the 3rd Division commanded by Major General
Joseph Thackwell (later by Sir
Colin Campbell). His brigade led the attack ordered by
Lord Gough at the
Battle of Chillianwalla on 13 January 1849. After rushing forward without firing to seize the Sikh guns, the 24th Regiment lost touch with the rest of their brigade and was left exposed to enemy fire from the surrounding jungle. The 24th was driven back, and lost its
Queen's Colour. Pennycuick and Lieutenant-Colonel Brooks of the 24th Regiment were killed, along with 20 other officers and 497 other ranks, including Pennycuick's 17-year-old son, who was serving as an ensign. ==Family==