Whilst analysing a source, a historian must not disregard the perspective of the source and the influences that shape perspective. Source A is written by the male German, Von Falkenhayn. Falkenhayn was a German general who was in charge of many operations during WWI, and was thereby of high rank and power. Being of high rank, Falkenhayn expresses the German point of view of confidence in the plans for the battle of Verdun as he holds a positive outlook on the tactics used to break stalemate at Verdun.
This perspective will cause a historian studying German attempts to break stalemate to question the reliability of the source. The date matches the year of the battle of Verdun and it is written in a formal manner as expected by military officials at the time. Source A also corroborates other evidence by reflecting the intended aim of the battle which was to lead the French to the battlefield and destroy them during their defence of the area. The Germans did in fact attempt to fulfil this aim making Source A a fairly reliable source.
On the contrary, Source B is written through the perspective of the British. General Haig was a man of high power and rank as he was the commander of the British Expeditionary Force (BEF) during WWI. This would influence his point of view about the battle of the Somme in reports such as Source B. The battle of the Somme was a British