The 248th (Grey Overseas) Battalion was based in Owen Sound, Ontario, and began recruiting in September, 1916. The unit went to England in May or June, 1917. The battalion was disbanded in England upon arrival and the men were absorbed into the 7th and 8th Reserve Battalions.
Sources:
“Grey Battalions in the Great War”. Grey Roots Museum & Archives, https://greyroots.com/story/grey-battalions-great-war, accessed on June 19, 2020.
“248th Battalion, CEF”. Wikipedia, https://en.wikipedia.org/wiki/248th_Battalion,_CEF, accessed on June 19, 2020.