Consisting of 1920 Rank & File, besides Officers; who on the 10th of June, 1798, left London in the morning, and actually began to Embark for Ireland at Portsmouth at 4 o’clock in the afternoon, having travelled 74 miles in 10 hours. (source 
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Quote
A Letter from Portsmouth, June 11: ‘Last night and this morning great numbers of the Guards have arrived here in coaches, chaises, fish carts, and carriages of every description that were to be had on the road . .. and will sail tomorrow morning for Ireland… .’ ‘Lond. Chron.’, 14 June 1798.
— Curator’s comments, British Museum. source
That’s not a bad rendering of Portchester Castle. I wonder if the Jolly Soldier actually existed.
This unrelated view, from a similar vantage point, shows buildings stretched along the length of the London Road
: Unknown artist, The Town & Harbour of Portsmouth, with a View of His Majesty’s Fleet Spithead Yale Center for British Art, Paul Mellon Collection, B1995.13.180. source