Read Luke 10:17-19
The seventy returned with joy, saying, “Lord, even the demons are subject to us in Your name.” And He said to them, “I was watching Satan fall from heaven like lightning. “Behold, I have given you authority to tread on serpents and scorpions, and over all the power of the enemy, and nothing will injure you.
Pray that missionaries will find to trust more in the Lord and exercise the authority they have over powers.
Pray for a realization that all the powers of the enemy are at best under their feet.
Pray that as Jesus reigned on earth in the days of His flesh, so shall missionaries reign in all their places of assignment.