'This Sergeant was in Switch Trench with Lieutenant Adams, when the Sergeant was hit in the head and arm by pieces of shell. The officer and non-commissioned oficer were seperated by the hostile barrage, and during this seperation Lieutenant Adams was hit. Sergeant Cosbrook spent two hours searching for him in the shelled area, and eventually found him in it. He then went for a stretcher party, 2 bearers were killed. Cosbrook went on with the other bearer and succeeded in getting his offcier back to Tea Trench. This non-commissioned officer has twice been recommended for acts of gallantry.'
Source: 'London Gazette'
Date: 1 May 1917

'On June 26th 1915 at Chunka Bluff, Cape Helles, during an attack on that position, he maintained communication with his battery throughout the attack, despite the fact that he was in the front line trenches and that the Turks were counter-attacking and shelling the position very heavily.'
Source: 'London Gazette'
Date: 11 October 1916

'During the attach on September 15th 1916, on the Somme, this NCO was one of a party who went forward under Lieut Adams to Switch Trench. They were under heavy shell fire throughout and early in the day Sergeant Cosbrook was wounded in the arm and head. He was separated from Lieut Adams by a barrage and it was then that Lieut Adams was wounded. Sergeant Cosbrook spent two hours in the German barrage on Switch and Crest Trenches searching for Lieut Adams, who eventually he found. He then went back through the barrage to get a stretcher party. Whilst returning with the party two of the bearers were killed and Sergeant Cosbrook went on with one other man, despite his wounds assisted to carry Lieut Adams back to our original front line. During the day he passed four times through the enemy barrage besides remaining in it for two hours searching for Lieut Adams.'
Source: 'London Gazette'

'During the attach on September 15th 1916, on the Somme, this NCO was one of a party who went forward under Lieut Adams to Switch Trench. They were under heavy shell fire throughout and early in the day Sergeant Cosbrook was wounded in the arm and head. He was separated from Lieut Adams by a barrage and it was then that Lieut Adams was wounded. Sergeant Cosbrook spent two hours in the German barrage on Switch and Crest Trenches searching for Lieut Adams, who eventually he found. He then went back through the barrage to get a stretcher party. Whilst returning with the party two of the bearers were killed and Sergeant Cosbrook went on with one other man, despite his wounds assisted to carry Lieut Adams back to our original front line. During the day he passed four times through the enemy barrage besides remaining in it for two hours searching for Lieut Adams.'
Source: 'London Gazette'