-A crown-work.

45.--A redan.

46.--A lunette.

47.--A mitre or priest-cap.

48.--A bastioned fort.

49.--Vertical section of a field intrenchment.

50.--Simple sap.

51.--Flying sap.

52.--Full sap.

53.--Crater of a military mine.

54.--Plan of the attack of a regular bastioned work.

[Illustration]

[Illustration]

[Illustration]

[Illustration]

[Illustration]

[Illustration]

[Illustration]

[Illustration]

[Illustration]

[Illustration]

[Illustration]

[Illustration]

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by Henry Wager Halleck

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