单选题
The 18th-century battlefield was, compared with that of the 20th century, an intimate theater, especially (41) in the engagement of Revolution, which were usually small even by the standards of the day, soldiers has to come to close quarters to kill; this fact reduced the mystery of battle, though perhaps not its terrors. But at least the battlefield lost some of its impersonality. In fact, in (42) to the 20th century combat, in which the enemy (43) remains unseen and the source of incoming fire unknown, in the 18th-century battles the enemy could be seen and some- times even (44) . (45) one's enemy may have aroused a singular (46) of feeling uncommon in modern battles. Before the assault occurred tension and anxiety (47) up as the troops marched from their movements was well understood by themselves and their enemies, who must have watched with feelings of dread and fascination. When the order came sending them (48) , rages, even madness replaced the attackers' (49) , while terror and desperation filled those who received the (50) .