From The Story of the 2/4th Oxfordshire and Buckinghamshire Light Infantry, by Captain G. K. Rose M.C. (Oxford: B.H. Blackwell, 1920)
During the night of March 20 a raid on the Battalion’s right was carried out near Cepy Farm by the 182nd Brigade. It was successful. German prisoners from three divisions corroborated our suspicion that the great enemy offensive was about to be launched. From headquarters to headquarters throbbed the order to man battle stations.
From The Story of the 2/5th Battalion Gloucestershire Regiment, 1914 – 1918, by A. F. Barnes, M. C., (Gloucester, The Crypt House Press, Limited, 1930)
On the night of the 20th/21st of March a strong raid by the 2/6th Warwicks was made against the enemy trenches east of Fayet. This raid was completely successful, and resulted in the capture of fifteen prisoners and three machine-guns, establishing the fact that the enemy forces opposite our immediate front had been increased by at least two Divisions, and, from prisoner statements, that an attack would be launched on the morning of the 21st.
The Fifth Army in March 1918, by Walter Shaw Sparrow, John Lane Company (1921)
Next evening, at ten o’clock, after our guns had poured in a great many shells, two companies of Warwickshire troops – Shakespeare for ever!—raided the German trenches beyond Fayet, partly to get a few prisoners, and partly to learn how much the foe’s ordinary line troops had been reinforced. Fifteen Germans were captured, and three German regiments, nine battalions, were found on a span of front formerly held by one regiment, or three battalions. More valuable still was the news that in five or six hours Ludendorff would open his attack. This warning was made known at once to all Headquarters, British and French.*
* Ludendorff says, I believe with truth, that on March 18 or 19 two Germans deserted from a trench mortar company and gave information to us of the impending attack.
War Diary of the 2/4th Royal Berkshire Regiment
Regiment. 2/4th Royal Berkshire
Location France, Ugny
Entry The ADJUTANT – INTELLIGENCE OFFICER and one Officer per Company spent the day in reconnoitring the ground of the Battle Zone Sector and the ground between SPOONER REDOUBT and HOLNON WOOD, being one of the positions to which the Battalion be required to move in the event of an attack. Light Training was carried out by the Battalion.