These sketches are very slight. The flag is unidentified but might be a French standard. Rather more detailed or annotated diagrams of the Battle of Trafalgar are on folios 9 verso and 31 verso of the sketchbook (D05456, D05479; Turner Bequest 24a). As with other diagrams in the book, this is crudely drawn, perhaps initially by an eye-witness to the battle who Turner met aboard the Victory.
Blank, but inscribed by Turner in black chalk ‘15 Sunday’
15 December 1805 was a Sunday, and possibly this was the day Victory was expected by Turner to arrive in the Medway, having sailed from Portsmouth on the 11th, although in fact she was delayed by adverse winds until the 23rd; see Introduction to the sketchbook.