He was educated at Bedford Modern School where the name of a house now commemorates him.
He played as a three quarter. After initially being turned down as too old to join the army in World War I, Edgar raised his own "sportsman"s" company of 250 sportsmen (also known as Mobbs" Own) for the Northamptonshire Regiment. He rose to command his battalion with the rank of Lieutenant Colonel.
Mobbs was killed in action, on July 29th 1917, at Zillebeke, Belgium, during the Third Battle of Ypres, while attacking a machine gun post.
His body has never been found, so his name is on the Menin Gate memorial. Mobbs is also commemorated with a bust in Northampton.
In 1921 the first Mobbs" Memorial Match was held between the East Midlands RFU and the Barbarians at Franklin"s Gardens. In 2008 the Barbarians played Bedford Blues in the Mobbs Memorial Match at Goldington Road and did so again in 2009.
The final Mobbs Match to feature the Barbarians took place in April 2011 against Bedford.
The fixture continues to be played with the Army Rugby Union facing Bedford and Northampton Saints in alternate years and the game helps to raise money for youth rugby in the area. A band from Northampton have named themselves The Mobbs after Edgar Mobbs. Also a road in Northampton, Edgar Mobbs Way, is named after Mobbs and is situated close to Franklin"s Gardens stadium.