"The vast army marched solemnly around the devoted walls. All was silent, save the measured tread of many feet, and the occasional sound of the trumpet, breaking the stillness of the early morning. The massive walls of solid stone seemed to defy the siege of men. The watchers on the walls looked on with rising fear, as, the first circuit ended, there followed a second, then a third, a fourth, a fifth, a sixth. What could be the object of these mysterious movements? What mighty event was impending? They had not long to wait. As the seventh circuit was completed, the long procession paused, The trumpets, which for an interval had been silent, now broke forth in a blast that shook the very earth. The walls of solid stone, with their massive towers and battlements, tottered and heaved from their foundations, and with a crash fell in ruin to the earth. The inhabitants of Jericho were paralyzed with terror, and the hosts of Israel marched in and took possession of the city. PP 491.1"
"And the second day they compassed the city once, and returned into the camp: so they did six days."
EGW's description of the marching around Jericho for six days directly alludes to Joshua 6:14. The details of the silence, the trumpets, and the watchers on the walls are all present in both accounts.
"And it came to pass on the seventh day, that they rose early about the dawning of the day, and compassed the city after the same manner seven times: only on that day they compassed the city seven times."
EGW's description of the marching around Jericho on the seventh day directly alludes to Joshua 6:15. The detail of marching seven times on the seventh day is a key element in both accounts.
"And Joshua adjured them at that time, saying, Cursed be the man before the Lord, that riseth up and buildeth this city Jericho: he shall lay the foundation thereof in his firstborn, and in his youngest son shall he set up the gates of it."
EGW directly quotes Joshua 6:26 regarding the curse on anyone who rebuilds Jericho.
"And ye, in any wise keep yourselves from the accursed thing, lest ye make yourselves accursed, when ye take of the accursed thing, and make the camp of Israel a curse, and trouble it."
The EGW passage directly quotes and refers to the concept of making Israel a curse and troubling it, which is a central theme in Joshua 6:18.
All the inhabitants of the city, with every living thing that it contained, “both man and woman, young and old, and ox, and sheep, and ass,” were put to the sword. Only faithful Rahab, with her household, was spared, in fulfillment of the promise of the spies. The city itself was burned; its palaces and temples, its magnificent dwellings with all their luxurious appointments, the rich draperies and the costly garments, were given to the flames. That which could not be destroyed by fire, “the silver, and the gold, and the vessels of brass and of iron,” was to be devoted to the service of the tabernacle. The very site of the city was accursed; Jericho was never to be rebuilt as a stronghold; judgments were threatened upon anyone who should presume to restore the walls that divine power had cast down. The solemn declaration was made in the presence of all Israel, “Cursed be the man before the Lord, that riseth up and buildeth this city Jericho: he shall lay the foundation thereof in his f…
"And they utterly destroyed all that was in the city, both man and woman, young and old, and ox, and sheep, and ass, with the edge of the sword."
The EGW passage closely follows the description of the destruction of Jericho in Joshua 6:21, including the killing of all inhabitants and the sparing of Rahab. It's a direct retelling of the biblical account.
"But of the cities of these people, which the Lord thy God doth give thee for an inheritance, thou shalt save alive nothing that breatheth: But thou shalt utterly destroy them; namely, the Hittites, and the Amorites, the Canaanites, and the Perizzites, the Hivites, and the Jebusites; as the Lord thy God hath commanded thee:"
Both passages describe the utter destruction of the inhabitants of a city and the dedication of valuable items to the tabernacle. Deuteronomy 20:16-17 provides the general principle of destroying certain cities, while EGW applies this principle to the specific case of Jericho, drawing from Joshua's account.