^chain blades are designed to cut in one direction.
Consider either a two person hand saw or chainsaw. Many used Stihl or Husky found used online will make your work easier and final result will look better too.
\"THE MOUNTAIN sat upon the plain
In his eternal chair,
His observation omnifold,
His inquest everywhere.
The seasons prayed around his knees,
Like children round a sire:
Grandfather of the days is he,
Of dawn the ancestor.\"