Final answer:
Explanation of military ground conditions: hemmed-in ground and difficult ground.
Explanation:
Surrounded by military forces: This is referred to as being on hemmed-in ground. For example, when an army has fortified cities behind them and narrow paths ahead, it creates a situation where only a small number of enemies can easily defeat a large group.
Serious; austere: This is described as difficult ground. An example is when an army penetrates deeply into enemy territory, leaving fortified cities in the rear, signifying a critical and serious situation.
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