24 from Judah, carrying shield and spear—6,800 armed for battle;

Read 1 Chronicles 12:24 Using Other Translations

The children of Judah that bare shield and spear were six thousand and eight hundred, ready armed to the war.
The men of Judah bearing shield and spear were 6,800 armed troops.
From the tribe of Judah, there were 6,800 warriors armed with shields and spears.