Prior to the widespread adoption of chainsaws, two-person crosscut saws were common. Today their use is rare, partly because sharpening them requires expertise and some specialized tools (Saw Tools Archives – Crosscut Saw Company). The people who knew how to do it well are also rapidly disappearing. Here’s a link to the US Forest Service Crosscut Saw Manual: 7771-2508-MTDC: Crosscut Saw Manual (usda.gov). You can also find lots of YouTube videos on the subject.