In Ban Phe, Songkran will be biggest on Friday, but my first attack was on Monday. It's grown since then. There are mobile and stationary groups of children and adults, and both have advantages. Stationary groups are easier to refill, usually have fresh ice and less spillage, and access to hoses. Mobile groups (almost always a barrel of water, a dozen or so people, and scoops and water guns in the back of a pick-up truck) can attack without warning, and from higher up, though they tend to be less efficient at reloading.
As an unarmed pedestrian, I got soaked by both.
Here, a stationary team and a mobile team soak each other. Those folks on the street had giant floating blocks of ice in their buckets.
On Friday, the staff of Siam English Training School will all take part and douse people together.