She applied for a pension as the widow of Wheeler Barnum.
From The Seventeenth Report of the Department of Public Records and Archives of Ontario 1928 by Alexander Fraser, L. L. D.: p149 - 14 December 1815 (court) Wrote to Francis Williams to deliver a dog of Mrs. Barnum. p158 - 8 October 1816 Joseph Wood 10 pounds Recognized for the peace and Good behavior of Joseph Wood, Christian Baker 5 pounds towards all his Majestys liege subjects and particularly toward Henry Willis 5 Pounds Martha Barnum for the space of Twelve months from this date. p197 The Court took into consideration of the Tavern Bills and agreed as follows. (To Wit) Martha Barnum 6 pounds.
From The Ontario Register Vol 1 #4 p223: Pensioners of the War of 1812: Martha Barnum Deceased husband Pvt. Wheeler Barnum Regiment 1 Norfolk died of illness 16 Mar 1813.