Following their victory in battle, the battlefield transforms from a site of conflict into a landscape of unimaginable wealth. The victorious nation arrives to find an unprecedented abundance of spoils left behind by their defeated enemies. They discover a vast array of possessions, encompassing silver, gold, and various movable goods [מצודת ציון, מלבי״ם]. Because the area is strewn with the corpses of the enemy, there is absolutely no one left to resist or protest as the victors collect the spoils [מצודת דוד]. Right upon these fallen bodies, they find highly valuable items and magnificent clothing [מלבי״ם, ביאור שטיינזלץ].
The gathering process becomes a complete clearing out of the area. The victors strip the battlefield entirely, taking everything for themselves in a manner reminiscent of how the Israelites once emptied Egypt of its wealth [מצודת דוד, מצודת ציון].
The sheer volume of the treasure creates an unusual challenge regarding what can actually be transported. The primary approach among commentators is that the people collected such a massive amount of loot that they simply lacked the physical strength to carry the immense weight [רש״י, מצודת דוד, ביאור שטיינזלץ]. Alternatively, because it was impossible to haul everything away, the people carefully sorted through the spoils, selecting only the lighter, highly valuable items to avoid a heavy burden [מלבי״ם]. Regardless of whether they loaded themselves to their absolute physical limits or selectively gathered only the most precious goods, the scale of the abandoned treasure is staggering. It takes them three full days just to finish collecting the spoils.