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The Seven Years War (1756-63)

Manuscript and printed maps and views, correspondence and journals from the first global war


Plan of Monongahela River, 1755 (Pennsylvania, USA)


Pencil, pen, black and brown ink and watercolour on paper, laid down on linen | Scale: 1:10,800 | RCIN 731064.a

A plan of the field of battle and the position of the British and French troops near the Monongahela River, 1755. French and Indian War (1754-63). Oriented with north to top. 

The plan shows Braddock's army in march formation, having just crossed the Monongahela. The bluffs formed by the river terraces are clearly shown. The position of the working party of Sir John St. Clair, Deputy Quarter Master General is shown near the front of the march.

One of two plans of the Battle of Monongahela, 9 July 1755 by Patrick Mackellar; the other plan is at RCIN 731064.b.

  • Patrick Mackellar (1717-78) (cartographer) [bottom right of title panel:] P. Mackellar Eng.r


    Army-USA-American Colonial forces
  • Watermark: Coat of arms in crowned double circle , "HONI SOIT QUI MAL Y PENSE" within outer and inner circle; countermark: the crowned monogram GR

    Mark, stamped: 776

    Condition: four fold lines; induced discolouration and slight foxing on both sides; laid down on linen

  • Scale: 1:10,800. The Distances are computed. Scale 300 y.ds to an Inch

    18.0 x 35.2 cm (neatline)

    28.4 x 35.2 cm (image and sheet)

  • Manuscript title:

    N.o 1 / A Sketch of the Field of Battle of the July upon the Monongahela, seven miles from Fort du Quesne, between the British Troops commanded by General Braddock / and the French & French Indians commanded by Mons.r de S.t Pierre, shewing the Disposition of the Troops when the Action began. [1755.] [Across top, in rectangular panel]

    Additional text:

    [top, below title, in title box, a key to the letters and symbols on the map:] Explanation.


    George III heading: [lacks number] Battle near Pittsburgh 9 July 1755.

    Other annotations: (Recto) none. (Verso) [left of centre, ink, obscured by linen:] Plan N. 1. / in Gov. Shirley's of the / 5th Nov. 1755; [right, black pencil, in a 20th century hand?:] XI/64A; [bottom right, red pencil:] 12/61 [the 61 is crossed out in black pencil]; [bottom right, black pencil:] XV/17[-a].

    George III catalogue entry:

    Pittsburgh A drawn Plan of the field of Battle of the of July upon the Monongahela 7 miles from Fort du Quesne (since called Pittsburgh) between the British Troops commanded by General Braddock, and the French and French Troops commanded by M. de S.t Pierre, shewing the Disposition of the Troops when the action began: by P. Mackellar Eng.r Another drawn Plan of D.o shewing the Disposition of the Troops about 2 o’clock: by D.o.

  • Subject(s)

    Pennsylvania, USA

  • Bibliographic reference(s)

    Reproduced in S. Pargellis (ed), Military affairs in North America 1748-1765. Selected documents from the Cumberland Papers in Windsor Castle. New York [and] London, 1936, facing p.114

Page revisions

  • 8 June 2024