Which two details support the central idea that the men on the expedition had to cope with isolation and hardship?

We turned in at 7 p.m. that night, and at 1 a.m. next day, the 25th, and the third day of our march, a breakfast of sledging ration was served. By 2 a.m., we were on the march again. We wished one another a merry Christmas, and our thoughts went back to those at home. We wondered, too, that day, as we sat down to our "lunch" of stale, thin bannock and a mug of thin cocoa, what they were having at home.