Original sentence: Twenty committed seppuku (with one failed attempt) on a hillside overlooking the castle after seeing its defenses breached, during the Battle of Aizu, in the 1868-1869 Boshin war
Edited sentence: A group of 20 stragglers committed seppuku (with one failed attempt) on a hillside overlooking the castle after seeing its defenses breached, during the Battle of Aizu, in the 1868-1869 Boshin war