When I was in the army some of us in support units had hard-top jeeps, while most combat arms units had soft-top jeeps. They had a Wire Cutter bolted to the front bumper that has been used at least since WWII when the Germans strung wire up to decapitate men in jeeps with the windshields folded down. Here's a picture from Operation Urgent Fury in Grenada 1983, and a PM Magazine article from 1984. There was no standard way to make these, but they were usually made of 90 degree angle iron, with one side flat against the bumper, and one side perpendicular like the second pic. Sometimes the corner angle was facing forward like the first pic. There was almost always a bend near the top or a second piece welded to it. And most of them had cutting notches ground into them, not cutters welded onto them. Notches cut into the corner of the angle iron looked a lot different from notches cut into one edge, but either kind should work. Sometimes there were notches only on the top bar, or only the main bar, and sometimes both. Some didn't even have a cutting notch, just the angled piece on top. I've never seen one like in the 3rd pic, which may have been something they added to WWII jeeps. I just remember a bunch like in the magazine article. A fence T-post would also work well instead of angle iron. I saw one that someone made but didn't have the notch angled right.
There were no longer Nazis trying to decapitate Americans as far as I know when I was in the army. But there was commo wire for field telephones strung everywhere in the field. And it crossed several dirt roads and trails. Sometimes it stayed on the ground, and other times a vehicle's tire could catch it and fling it into the air. If you were in the next jeep after a wire flipped up off the ground, you could have a very bad day. The wire has several strands of copper wire, plus a few strands of steel wire to make it harder to break or cut. I caught a piece of fishing line or something across the neck while riding my bike down a city street and I'm glad the @$$hole that put it there didn't use a piece of wire. One time I thought about welding a wire cutter to the front bumper of my ATV. Even if it never caught a piece of wire, it might keep me from being swatted in the face with a branch.
https://www.youtube.com/watch?v=YmcnN_n3cA4