In August I was asked by the Hampshire Field Club and Archaeological Society to undertake a tentative excavation of the earthwork near Winchester known as Oliver Cromwell's Battery to ascertain its date of construction. Mr. F. W. Talbot, the lessee of the site, Mr. E. S. McEuen, the Rev. S. T. Percival, Mr. G. Weeks, and Mr. Lewis Williams at once offered to join me, and with the help of our own men we were the working party. We had the assistance of the Hon. Secretary Mr. Frank Warren, F.S.A., Dr. J. P. Williams-Freeman, Sir Thomas Troubridge, F.S.A., and Mr. V. B. Crowther-Beynon, F.S.A., the last named having been most helpful throughout.