Military organization usually follows these principles:
Poor communication equipment and inadequate command capabilities require separating different military branches as much as possible, which can reduce command pressure and avoid confusion.
Conversely, good communication equipment and high command levels allow for the mixed integration of various branches under unified command.
The latter is the concept of a "composite battalion," where modern battalions include infantry, artillery, armored units, and even air forces. These branches can coordinate closely and form powerful combat capabilities.
But this can only be achieved with modern communication equipment and high command levels; otherwise, it may not only fail to form combat power, but also lead to chaos.
The most typical example is the early stage of World War II with the Russians. They dispersed tanks, artillery, and aircraft among infantry units.
