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Fortifications.

Estimated cost of ordnance of all kinds required for the armament of fortifications, agreeably to statement 2, embracing cannon mounted and 100 rounds of ammunition for each piece.

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Works to be constructed after those in table D, statement 1, are completed.-Table E.

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28

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17

49

24

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12

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12

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97

67

4

18

6

7

4

113

78

5

21

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Estimated cost of ordnance of all kinds required for the armament of fortifications, &c.—Continued.

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Fortifications.

Ordnance.

Estimated cost of ordnance of all kinds required for the armament of fortifications, &c.—Continued.

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Works to be constructed after those in table D, state- Required........... ment 1, are completed.-Table E.

On hand....

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1,700 21,100 1,100 1,700 21,000

3,900

1,200 9,000

4,800

400

1,100

3,900

1,200

6,800

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Fortifications.

Ordnance.

Estimated cost of ordnance of all kinds required for the armament of fortifications, &c.—Continued.

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NOTE. The cost of saltpetre and brimstone may be estimated at one-half of the cost of gunpowder.

ORDNANCE OFFICE, Washington, January 16, 1840.

Carriages.

Projectiles.

Powder.

Total amount.

REPORT ON THE NORTHERN FRONTIER.

This frontier extends, as described by the terms of the resolution, from Lake Superior to Passamaquoddy bay, a distance of somewhat more than two thousand miles, binding all the way on the British American Provinces.

Whether we regard the strongly marked geographical features of this frontier, presenting, as it does, for the most part, a chain of great lakes or inland seas, stretching along the border, the common property of both nations, and affording facilities for an extensive commerce, almost rivalling that of the ocean itself; or whether we look to the growing strength of our colonial neighbors, fostered by the immense power and resources of the mother country; its vast importance cannot fail to impress us with the necessity of being prepared, not only for defence along that line, but also to act offensively, with decisive effect, in the event of our being involved in a conflict.

From the peculiar character of this frontier, its defence must necessarily partake somewhat of the system applicable to the seacoast; for, although it is denominated inland, in contradistinction to the latter, it is, nevertheless, maritime in many of its features, and must be treated accordingly for purposes of defence. So important is the mastery on the lakes, in any military operations in that quarter, that it is scarcely to be doubted that, in the event of war, there will be Some naval preparations on both sides, and a struggle for the ascendancy on those waters. Whichever power shall acquire that, even temporarily, will have the means of assailing his adversary with great effect along the shores of the lakes, in the absence of fortifications, by occupying the harbors, destroying the towns, (some of which are fast advancing to the rank of cities,) and controlling the commercial operations of which those lakes constitute the principal channel. These considerations render it highly expedient-indeed, necessary-to fortity the larger harbors on the lakes, as well as the more important passes on the straits and rivers by which they are connected.

Without entering fully into the military details of the subject, which might be deemed somewhat out of place here, regarding the object of the resolution, which seems to look rather to the expense involved, the board will proceed to enumerate the works of defence deemed necessary on the northern frontier, beginning at Lake Superior; merely glancing at the effects and advantages which are likely to result from the establishment of those works.

1. Fort at Falls of St. Mary,-A fort here will control the communication between Lake Huron and Lake Superior, and, at least, prevent an enemy from availing itself of it for purposes of communication and for the transportation of supplies, if it does not secure those important advantages to us, which it would do, unless counteracted by a work on the British side of the line. In that event, almost certain to occur, it would be neutralized, but would still serve to cover and protect our settlements along the St. Mary, and form a rallying point for local defence in times of alarm.

Estimated expense of fort, barracks, &c. ...

2. Fort at Michilimackinac.-Although this position is somewhat interior, it is regarded of high importance from its geographical relations. A fort here, in conjunction with floating batteries, may be made to command, effectually, the approach to Lake Michigan, and shut out an enemy who might possess a naval ascendancy on Lake Huron; thus protecting the entire circumference of Lake Michigan from attacks to which it would otherwise be exposed, even from a small force, and securing it to ourselves as a safe channel of communication with the rich and productive States in the rear, whose shores it washes.

Estimated expense

$75,000

50,000

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