The church contains a number of items with relevance to the Sherwood Rangers.
There is a stained glass window which is dedicated to the members of the Sherwood Rangers Imperial Yeomanry who died during the Second Boer War (1899-1902). The SRIY served as the 10th Company in the 3rd Imperial Yeomanry regiment (3 IY).
The window is shown below. Alongside is a photograph of the dedicatry marble tablet which lists the names of the fallen.
The church also contains a Memorial Window for those Sherwood Rangers who fell in the Great War. The window was dedicated on 21st May 1922 and shows the regimental crest and Battle Honours. The dedication reads "Remember ye with Thanksgiving and with all Honour before God and man the Officers and men of the Notts Sherwood Rangers Yeomanry who gave their lives for King and Country in the Great War, 1914-19, to whose memory this window is dedicated."
A series of oak panels records the names of the men of Retford and of the Sherwood Rangers who were killed. The photograph shows the central panels which lists the Sherwood Rangers. The Roll of Honour for the First World War can be seen online, here.
St Swithuns also holds a book of Remembrance for those who fell in the Second World War (1939-1945).