 In 1878 he transferred to the Pennsylvania Commandery where he served as Chaplain from 1878 to 1886 and as Junior Vice Commander from 1886 to 1887.Trumbull was also active in the Grand Army of the Republic and a member of George G. Meade Post 1 of Philadelphia.He gave remarks welcoming former President and General Ulysses S. Grant on December 18, 1879.