This proves clearly that the ions move in different directions with different Velocities.
"The Mechanism of Life"
Stéphane Leduc
During the progress of the battle I went many times into the broken heart of Arras while the bodies of men and horses lay about where transport columns had gone galloping by under fire and while the shrill whine of high Velocities was followed by the crash of shells among the ruins.
"From Bapaume to Passchendaele, 1917"
Philip Gibbs
Later, after the first day's battle, in spite of some high Velocities from long-range guns, the streets and squares were filled with soldiers, and Arras was tumultuous with the movement of men and horses and mules and wagons.
"From Bapaume to Passchendaele, 1917"
Philip Gibbs