This marriage is so far conjectured. James Knibbs was from Bedworth which is next to Foleshill in Warwickshire where the marriage took place. James was killed in 1917, and Rosella Knibbs remarried in 1920.

In Memory of
Private JAMES KNIBBS
10728, 2nd/4th Bn., Oxford and Bucks Light Infantry
who died on 22 August 1917 Remembered with honour
TYNE COT MEMORIAL

I suspect that the timing of James' death indicates that he was almost certainly killed during what is known as the Third Battle of Ypres - Passchendaele
On 31st July 1917, behind the newly mastered creeping barrage, the allied troops climbed out of the their trenches along the whole front line, from Boesinghe in the North to Le Gheer in the South, and advanced towards the German forces. The enemy’s first line was quickly taken (the Germans had adapted the scheme of defence in depth, which consisted of a thinly defended front line of machine gun outposts and strongly more heavily defended support line) and the British pushed forward about one mile before meeting much stiffer resistance. Later in the afternoon the advance was stopped and pushed back in places by a carefully coordinated counter attack by specially trained troops. However a worse enemy was afoot, the worst weather for 75 years, which turned the whole battlefield into a quagmire, the whole attack was stalled until 10th August.

It is estimated that Third Ypres cost the Allies about 300,000 casualties (35 men for every metre gained – many of them were lost to the mud of Flanders and have no known grave, only to be commemorated on the Menin Gate and Tyne Cot Memorials to the missing) and the Germans a further 260,000 casualties.
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We believe this is the James Henry Knibbs that appears as being born in Foleshill District, Warwickshire, Jan-Mar 1893