## Moreover ##
"And also"
## send the hornet ##
possible meanings are 1) God will send actual flying insects that sting people and cause pain, or 2) God will cause a great fear to fall on the people so that they become terrified.
## a great and fearsome God ##
AT: "a great and awesome God" or "a great God who causes the people to fear"
## little by little ##
"slowly"