With no explanation, label text_A→text_B with either "entailment", "neutral" or "contradiction".
text_A: After the wars he served a diplomatic role at the Congress of Aix-la-Chappelle and was a major contributor to the development of the Prussian General Staff as Chief.
text_B: After the wars he was a major contributor to the development of the Prussian General Staff as Chief.
entailment.