Economics, when discussing the factors of production, the term land refers to

In economics, factors of production, resources, or inputs are what is used in theproduction process to produce output—that is, finished goods and services. ... Materials and energy are considered secondary factors in classical economicsbecause they are obtained from land, labour and capital.

The statistics for the eastern war are grim. more than three-million men died in the fighting, more than nine-million men were wounded, and every major country which participated lost its form of government.