How did the United States obtain Lenape military support for the planned Detroit expedition?
The Treaty of Fort Pitt was crafted to turn the Lenape Nation into a military ally for a western offensive against British Detroit. By tracing congressional funding, the Lewis brothers’ negotiations, and the treaty’s…
Expectation versus outcome
Congress expected a reliable Lenape ally for the Detroit offensive, but the treaty’s promises were never fulfilled.
| The plan needed | What happened | Why it mattered |
|---|---|---|
| Lenape warriors would join the American assault on Detroit | The treaty was buried in committee and no coordinated Lenape force participated | The United States proceeded without the anticipated native support |
| Construction of a protective fort in Delaware country | No fort was built after the treaty’s signing | Lenape civilians remained unprotected as promised |
| Recognition of a Lenape‑led state with congressional representation | Congress never acted on the proposal | The Lenape remained a separate nation without formal political integration |
Negotiation and signing of the treaty
In March 1778 the Continental Congress dispatched brothers Andrew and Thomas Lewis to the western frontier, allocating $10,000 for trade goods intended to persuade the Lenape. Their arrival in Pittsburgh marked the start of intensive talks with leaders such as Koquethaqechton, Hopocan, and Gelelemend. After weeks of exchange, the parties convened on September 17, 1778 at Fort Pitt, where the treaty was formally signed before witnesses McIntosh, Brodhead, and Crawford. The document promised the United States unhindered passage through Lenape territory, a supply of clothing and weapons, and the construction of a defensive fort to shelter Lenape civilians.
The treaty also demanded that Lenape warriors join a planned assault on British Detroit, a strategic objective for the revolutionary cause. In return, the United States pledged to recognize a Lenape‑led political entity and to provide ongoing material support. Contemporary congressional records note the allocation of the $10,000 as a “trade fund” earmarked for blankets, ammunition, and other necessities, underscoring the material inducements tied to the military agreement.
Congressional handling and legislative inertia
Despite the ceremony at Fort Pitt, the treaty never progressed beyond the drafting stage in the Continental Congress. Minutes from the Committee on Indian Affairs record that the agreement was placed on a docket and effectively “buried in committee,” with no further debate or funding disbursement. This procedural stall meant that the promised supplies and fort construction never materialized, leaving the Lenape without the resources stipulated in the treaty. The lack of legislative follow‑through also prevented the formal recognition of a Lenape‑led state, a provision that had been highlighted in the treaty’s preamble.
Correspondence from the State Department, preserved in the National Archives, later described the Fort Pitt treaty as an early but abortive example of U.S. treaty‑making with Indigenous peoples. Officials noted that the urgency of the war effort and competing priorities contributed to the treaty’s neglect. As a result, the United States entered the Detroit campaign without the anticipated native contingent, and the Lenape received only sporadic, limited supplies in the 1780s, far short of the original agreement.
Impact on the Detroit expedition
The failure to secure Lenape warriors forced General George Washington’s planners to revise the Detroit operation. Military dispatches from late 1778 reveal that the Continental Army proceeded with a reduced force, relying on regular troops and militia rather than the promised native allies. The absence of a coordinated Lenape contingent diminished the expedition’s logistical reach, as the Lenape had been expected to guide troops through unfamiliar terrain and provide intelligence on British positions. Subsequent reports from the field describe the campaign as “under‑strength” and note that the lack of indigenous support contributed to its eventual abandonment.
Later analyses by historians such as Alan Taylor argue that the treaty’s collapse illustrates a broader pattern of broken promises to Native nations during the Revolution. The Detroit offensive, intended to strike a blow against British supply lines, never materialized in the form envisioned by the 1778 treaty. Instead, the United States redirected resources to other fronts, effectively sidelining the Lenape’s strategic role and reinforcing a legacy of mistrust between the new nation and Indigenous peoples.
Long‑term consequences for Lenape–U.S. relations
In the years following the failed treaty, the Lenape received only fragmented assistance, primarily in the form of limited food rations and scattered trade items. The promised fort in Delaware country was never erected, leaving Lenape families exposed to frontier violence and displacement. Congressional records from the 1780s show occasional appropriations for “emergency supplies,” but these were insufficient to sustain the community or to honor the treaty’s broader commitments. The Lenape’s political aspirations, including representation in Congress, remained unrealized, reinforcing their status as a distinct nation without formal integration into the United States.
The episode set a precedent for future treaty negotiations, as later agreements with other tribes often echoed the same pattern of ambitious promises followed by minimal implementation. Scholars cite the Fort Pitt treaty as a cautionary case where diplomatic rhetoric outpaced practical execution, shaping the trajectory of U.S.–Native relations well into the nineteenth century. The lingering resentment among Lenape descendants underscores the enduring impact of the unfulfilled 1778 accord on collective memory and tribal identity.
Timeline: The Treaty of Fort Pitt is signed
- March 1778 Lewis brothers arrive in Pittsburgh to begin negotiations
- September 1778 Treaty of Fort Pitt signed at Fort Pitt
- September 17, 1778 Formal signing witnessed by McIntosh, Brodhead, Crawford
- Late 1778 Congressional committee shelves the treaty, no funds disbursed
- 1780s Lenape receive limited supplies, no fort constructed