On the eastern side of Sinodun Hill, at Little Wittenham, is a stone commemorating the 150th anniversary of the carving of a poem on a nearby beech tree by Joseph Tubb of Warborough Green in 1844-5. The text on the monument was taken from a tracing made in 1965 by Dr. Henry Osmaston.

As up the hill with labr'ing steps we tread
Where the twin Clumps their sheltering branches spread
The summit gain'd at ease reclining lay
And all around the wide spread scene survey
Point out each object and instructive tell
The various changes that the land befell
Where the low bank the country wide surrounds
That ancient earthwork form'd old Mercia's bounds
In misty distance see the barrow heave
There lies forgotten lonely Cwichelm's grave.