Yahweh is on their side (Zech 9:14-9:15)

“Then Yahweh will appear

Over them.

His arrow goes forth

Like lightning.

Yahweh God

Will sound the trumpet.

He will march forth

In the whirlwinds of the south.

Yahweh of hosts

Will protect them.

They shall devour their enemies.

They shall tread down

Those shooting sling shot stones.

They shall drink

Their blood

Like wine.

They will be full of blood

Like a drenched bowl,

As the corners of the altar.”

Yahweh will clearly be on their side.  Yahweh was going to be like a lightning arrow.  He was going to sound the trumpet for them to march forward.  He was going to be like a whirlwind protecting them.  Thus, they would devour their enemies and tread down the sling shot shooters.  They would be so successful that they would drink the blood of their enemies like wine.  Their bowls would be so drenched with blood that it would look like the corners of the sacrificial altars in the Temple.