In 1815 Alten led Wellington's 3rd Division during the Hundred Days.
This command included Maj-Gen Colin Halkett's 5th British Brigade, Col Christian Ompteda's 2nd KGL Brigade and Maj-Gen Friedrich Kielmansegge's 1st Hanoverian Brigade.
Parts of the division were heavily engaged at the Battle of Quatre Bras.
At the Battle of Waterloo, the 3rd Division held the front line throughout the day and suffered very heavy losses.
Severely wounded in the battle, Alten's conduct won for him the rank of Count von Alten.

When the King's German Legion ceased to exist, Alten was given the command of the Hanoverians in France.
In 1818 he returned to Hanover, where he subsequently became minister of war and foreign affairs, and rose to the rank of Field Marshal.
At the same time, he was retained on the British Army list as Major-General Sir Charles Alten, GCB He died in 1840.
A memorial to Alten has been erected at Hanover.
He is buried in the Neustädter Kirche.
In 1815 Alten led Wellington's 3rd Division during the Hundred Days. This command included Maj-Gen Colin Halkett's 5th British Brigade, Col Christian Ompteda's 2nd KGL Brigade and Maj-Gen Friedrich Kielmansegge's 1st Hanoverian Brigade. Parts of the division were heavily engaged at the Battle of Quatre Bras. At the Battle of Waterloo, the 3rd Division held the front line throughout the day and suffered very heavy losses. Severely wounded in the battle, Alten's conduct won for him the rank of Count von Alten.
When the King's German Legion ceased to exist, Alten was given the command of the Hanoverians in France. In 1818 he returned to Hanover, where he subsequently became minister of war and foreign affairs, and rose to the rank of Field Marshal. At the same time, he was retained on the British Army list as Major-General Sir Charles Alten, GCB He died in 1840. A memorial to Alten has been erected at Hanover. He is buried in the Neustädter Kirche.
Charles, Count Alten