| Result | British tactical victory; American delaying effect | American victory |
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| Tactical outcome | Benedict Arnold’s smaller American fleet fought the stronger British squadron in the confined water west of Valcour Island, suffered heavy losses and then attempted a night withdrawal south. | A small rebel force associated with Ethan Allen, Benedict Arnold and the Green Mountain Boys surprised the lightly held British post and took Fort Ticonderoga with little fighting. |
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| Strategic effect | The Americans lost most of the fleet, but the naval campaign consumed time and helped delay the British advance down Lake Champlain until the campaigning season was ending, preserving the northern approach for the winter. | The capture opened a strategically important Lake Champlain position to the revolutionaries and gave them access to artillery and stores; guns from the northern forts later contributed to the artillery concentration around Boston. |
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| Terrain problem | Valcour Bay offered confined water that could limit the ability of the larger British squadron to deploy all its strength at once. The battle was shaped by wind, channels, island cover and the geometry of naval maneuver rather than by hills and roads. | Ticonderoga sat at a narrows controlling movement between Lake George and Lake Champlain. The strategic value of the site was far larger than the number of troops inside the fort on May 10. |
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| Intelligence problem | Arnold deliberately chose ground—water, in this case—that could complicate British deployment. Carleton’s force nevertheless possessed a better-built and more powerful naval establishment by the time the fleets met. | The attackers exploited surprise and local knowledge. The British garrison did not face a formal siege; the action turned on reaching and entering the fort before resistance could be organized. |
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| Turning point | The Americans could not win a prolonged gunnery contest against the stronger squadron. Their tactical problem shifted from holding the line to escaping south under darkness before the British could seal the route. | The decisive moment was penetration of the post itself. Once the small garrison was surprised inside a fort not prepared for a full defense, the contest was effectively settled. |
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| Documented OOB records | 6 | 5 |
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| Tactical phases | 5 | 5 |
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| Command decisions analyzed | 1 | 1 |
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| Primary-source records | 1 | 1 |
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| Modern/historical geography anchors | 2 | 2 |
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