Ehud kills Eglon
Ehud, a left-handed Benjamite, brought Moab's tribute to King Eglon, killed him with a hidden sword, and led Israel to victory; Shamgar also struck down 600 Philistines.
Ehud put out his left hand, and took the sword from his right thigh, and thrust it into his body.
Judges 3:21 (World English Bible)
Ehud strapped a short double-edged sword to his right thigh, where guards checking a right-handed man wouldn't look. After killing Eglon in his private room, he locked the doors and escaped while the servants waited outside. Israel then seized the Jordan fords and defeated Moab.
Judges adds a single verse about Shamgar, who struck down 600 Philistines with an ox goad.
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Dating notes
Judges 3:30 says the land had rest 80 years; Ussher counts those from Othniel's deliverance, placing Ehud in 1325 BC. Shamgar (3:31) is placed with Ehud. Ussher overlaps some oppressions and rest periods, counting each rest from the previous deliverance, so that the judges fit the 480 years of 1 Kings 6:1.