Also click multiple times from one space. It'll send halves each time but they collide since you're sending fast, building them up. Basically allowing you to send a whole unit at once.
Tip: mostly go for their spaces instead of the grey.
Going for them: taking out their units, making them have one less space (possibly), making you have one more space (possibly)
Going for grey: making you have one more space (possibly)
You can tell which is the better choice... ;D
 "Little Wheel"){kind=icon}
 "Vox Populi, Vox Dei(a werewolf thriller)"){kind=icon}
 "Turn Based Battle!"){kind=icon}
 "This is the Only Level"){kind=icon}
 "I Love Traffic"){kind=icon}
 "Civiballs"){kind=icon}
 "Bunny Invasion 2"){kind=icon}
 "Casual Gameplay Escape"){kind=icon}
 "SeppuKuties"){kind=icon}
 "Monster Basement"){kind=icon}
 "Feel the Beat (F2Jam)"){kind=icon}
 "Age of War"){kind=icon}
 "Damijin's Adventures"){kind=icon}
 "Matcheroo"){kind=icon}
 "Psychopath"){kind=icon}
 "Prism- Light the Way"){kind=icon}
 "Battle Pool"){kind=icon}
 "Tactical Assassin 2"){kind=icon}
 "Nano War"){kind=icon}