Predefined Animation While Controlling IMGMovement

As for you code you need to change

Function soldierUpdate()
Cls
DrawImage background, 400, 263
DrawImage soldier, xSoldier, ySoldier, frameSoldier
Delay(50)
Flip
End Function

Function monsterUpdate()
Cls
DrawImage background, 400, 263
DrawImage monster, xMonster, yMonster, monsterFrame
Delay(50)
Flip
End Function

to

Function DrawingUpdate()
  DrawImage background, 400, 263
  DrawImage soldier, xSoldier, ySoldier, frameSoldier
  DrawImage monster,xMonster,yMonster,monsterFrame
  Delay(50)
  Flip
  cls
End Function

calls this instead of
soldierUpdate()
monsterUpdate()