Alten was with John Moore in Sweden and Spain.
He commanded the 2nd Flank Brigade in Moore's campaign though he missed the Battle of Corunna.
He participated in the disastrous Walcheren expedition in the summer of 1809.
He was soon employed once more in the Peninsula, and at the Battle of Albuera he commanded an independent KGL brigade.
An incident in the battle highlights both the abilities and the limitations of Alten.

Alten was ordered to evacuate Albuera village, which could be retaken by the Portuguese as soon as they could arrive, and move up the ridge to reinforce the dwindling line.
The order was carried by a Portuguese ADC and Alten, a good and conscientious Hanoverian soldier, believed that it must have been distorted in transmission.
He refused to move until relieved by the Portuguese.

In April 1812 Arthur Wellesley, Viscount Wellington placed him at the head of the famous Light Division, which consisted of the 1/43rd and 1/52nd Light Infantry, 95th Rifles, and 1st and 3rd Portuguese Caçadores.
In this post he worthily continued the records of Moore and Robert Craufurd at the battles of Salamanca, Vitoria, the Pyrenees, the Nivelle, the Nive, Orthez and Toulouse.
His officers presented him with a sword of honour as a token of their esteem.
Wellington called Alten, "the best of the Hanoverians".
Comparing him with Craufurd, Charles Oman writes:
Charles Alten, [Craufurd's] successor in command of the Light Division being a general of much more pedestrian quality, who might never fail to make an attempt to obey Wellington's orders to the best of his ability, but could never supplement them by any improvisation of his own, of which he was incapable.
Alten was with John Moore in Sweden and Spain. He commanded the 2nd Flank Brigade in Moore's campaign though he missed the Battle of Corunna. He participated in the disastrous Walcheren expedition in the summer of 1809. He was soon employed once more in the Peninsula, and at the Battle of Albuera he commanded an independent KGL brigade. An incident in the battle highlights both the abilities and the limitations of Alten.
Alten was ordered to evacuate Albuera village, which could be retaken by the Portuguese as soon as they could arrive, and move up the ridge to reinforce the dwindling line. The order was carried by a Portuguese ADC and Alten, a good and conscientious Hanoverian soldier, believed that it must have been distorted in transmission. He refused to move until relieved by the Portuguese.
In April 1812 Arthur Wellesley, Viscount Wellington placed him at the head of the famous Light Division, which consisted of the 1/43rd and 1/52nd Light Infantry, 95th Rifles, and 1st and 3rd Portuguese Caçadores. In this post he worthily continued the records of Moore and Robert Craufurd at the battles of Salamanca, Vitoria, the Pyrenees, the Nivelle, the Nive, Orthez and Toulouse. His officers presented him with a sword of honour as a token of their esteem. Wellington called Alten, "the best of the Hanoverians". Comparing him with Craufurd, Charles Oman writes:
Charles Alten, [Craufurd's] successor in command of the Light Division being a general of much more pedestrian quality, who might never fail to make an attempt to obey Wellington's orders to the best of his ability, but could never supplement them by any improvisation of his own, of which he was incapable.
Charles, Count Alten