In May 2006, a book by MacCormick was published under the pen name Alan MacDonald, Pro Patria Mori: The 56th (1st London) Division at Gommecourt, 1st July 1916.
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As part of General Sir Edmund Allenby's Third Army, the 46th Division was involved in the diversion at Gommecourt on the first day on the Somme, 1 July 1916.
On 1 July 1916, the first day on the Somme, the Grimsby Chums were in the first wave attacking the fortified village of La Boisselle, just south of the Albert-Bapaume road.