Overprinted in colour in the field, this map shows the Allied front line at the Ypres Salient on 2 December 1917. Although this was some weeks after the formal end of the notorious battle of Passchendaele, an action took place on the night of 1st/2nd December in the areas to the north and east of Passchendaele village shown on this map.
Apart from the German defences (in red), the most notable features of the map are the blue shaded areas. These mark the extensive wet and waterlogged areas facing the front.
Exacerbated by poor weather and the devastation of the ground by the intense artillery bombardment, the conditions had continually hampered the advance. Such, in fact, was the fluid and incomprehensible nature of the terrain that the strong blue line marking the front is only an approximation.
Despite the production of this map, no further British advances would take place. The gains would be lost during German advances in the following spring.