The plaque is on the back of one of the choristers stalls in the chancel.
South side, back row, ninth from the west end.

Cathcart's Hill Cemetery

Cathcart's Hill Cemetery, 1855
From the Roger Fenton Catalogue
The Library of Congress
Rep.No. LC-USZC4-9222
FOX STRANGEWAYS,
KILLED AT BATTLE IN
INKERMAN NOV 5 1855.
DD: FRIENDS.
Further Information (From the 1873 Guide to the Church)
Brigadier-General Strangways served as a young subaltern with the Rocket Troop of the Royal Horse Artillery, sent to Germany and placed under the orders of the Crown Prince of Sweden in 1813, and was engaged in the battle of Goerde, 15th September, and the actions around Leipzig, 16th-19th October 1813, during which he succeeded to the command of the troop, his immediate commander, Major Bogue having been killed. For his services on that occasion he received the order of "St Anne" from the Emperor of Russia, and the order of the "Sword" and a gold medal for "bravery and good conduct" from the Crown Prince of Sweden, both of whom were eye witnesses of his gallantry during that short but eventful campaign.
He served in the campaign of 1815 and was dangerously wounded at Waterloo.
On the outbreak of the Crimean War, he embarked with the army for the east as a Lieut-Colonel of Horse Artillery, and succeeded to the command of the whole of the artillery (on General Cator's resignation through sickness) with the rank of Brigadier-General. He landed with the army in the Crimea, and was present at the battles of the Alma and Balaklava, and the first bombardment of Sebastopol. On the morning of the 5th November 1854, at the great battle of Inkerman, General Strangways was on horseback at Lord Raglan's right hand, when a shell from the enemy burst among the staff, and carried away his left leg. The shock was so great that he died about an hour afterwards. Lieut-Colonel Adye, the Assistant Adjutant-General to the Artillery, was with him when he fell, and received his last words. He was buried the following day on Cathcart's Hill, deeply lamented as a brave, chivalrous officer and a kind friend. A nobler soldier never breathed.
ADDENDUM
According to Colborne and Brine in "The Last of the Brave", Strangways marble gravestone inscription read:-
To the memory of
Brigadier General
Fox Strangways
Killed in action 5th Novr. 1854
Also transcribed by Colborne and Brine from the stone is a substantial amount of script in a foreign language, possibly Russian or Greek.
Strangways name also appears on the monument to the Officers and men of the Royal Artillery at Cathcart's Hill.