Final answer:
The condition of King James II's army is unspecified according to the given statement; therefore, the correct answer is d) Unknown.
Step-by-step explanation:
Based on the given information, the condition of King James II's army is not specified, so the correct answer would be d) Unknown. The statement mentions knowing the enemy is open to attack, but if our own men are not in a condition to attack, we cannot achieve full victory. This implies that we do not have knowledge of King James II's army's readiness or condition, leading to the conclusion that the army's status is undisclosed in the provided context.