Time travelling tree

The woods decay, the woods decay and fall..
Tennyson

This morning I was wandering the woods as usual, looking at birds and bluebells, and I came upon this fallen tree, which the landowner had started to saw.
It is an oak, rotten at the base, which is why it fell in the winter storms. The trunk is (was) about 20 feet high before dividing into branches.
I sat down and counted the rings, which are very close together. Definitely over 100, but I soon gave up. I started, instead, to think about what this wood, and the world, looked like 100 years ago. It was 1914...