Please refer to the bold .
Samyukta Āgama (2) 43
Sakka Saṃyutta
Suvīra
Thus have I heard, once, the Buddha was staying at Sāvatthī, in the Jeta Grove, Anāthapiṇḍika’s Park.
At that time the World-honored One said to the monks: “Once the asuras were gathering the four kinds of armies: elephants, cavalry, chariots and infantry, all well equipped with arms. They desired to march on the palaces of the Tusita heaven, and do battle with the gods.
P/s : Tavatimsa should be the right one .