[1] Koehler is remembered for his invention of a gun-carriage allowing the axis of the gun to be depressed to an angle of seventy degrees.

[3] Colonel John Drinkwater in his accounts claimed that the gun hit its target 28 times out of 30 when aimed at the Spaniards' San Carlos Battery.

He joined the Governor of Gibraltar's staff and despite the poor first impressions he first made he was to become a confidential aide de campe with Charles Holloway.

He commanded the army of the United Belgian States in 1790 which fought against the troops of the Austrian Emperor Leopold II during the Brabant Revolution.

[5] In 1794, Gilbert Elliot, Earl of Minto who was to be a viceroy to the short lived Anglo-Corsican Kingdom, Lieutenant-colonel John Moore and Koehler went to Corsica for talks with the renegade General Pasquale Paoli.

The legal battle went on until 1859 when it was ruled that three people should get a share of over £7,600 from his estate and over fourteen thousand pounds worth of interest.