See electric charge
During the european middle ages, a charge often meant an underage person placed under the supervision of a nobleman. Charges were the responsibility of the nobleman they were charged to, and they were usually expected to be treated as guests or a member of the household. Charges were at times used more or less openly as hostages, ensuring that the parents kept in line.
To charge is a manoeuvre in battle where soldiers rush towards their enemy to join in close combat. Charges have lost a lot of their effectiveness over the last 150 years because of handguns, assault rifles, and various forms of of artillery. See also military tactics.