Jack Vance, as he left the house, had caught up a double handful of snow, which he had been pressing into a hard ball as he ran down the path, determining in his own, mind to be the first to open fire on the snow man.

Without a moment's hesitation he flung the missile at the intruder's head, and, to the intense delight of his companions, it struck the latter fairly on the mouth, causing him to lose his precarious foothold on the wall and fall back into the road.
It needed no further warning to inform the Birchites that the Philistines were upon them, and every one set to work to lay in a stock of snowballs as fast as hands could make them.

"Look out!" cried Kennedy.

Young Noaks's face rose once more above the top of the wall, and the next moment a big stone, the size of hen's egg, whizzed past Diggory's head, and struck the garden door with a sounding bang.
"Oh, the cad!" cried Acton; "let's go for him." The whole garrison combined in making a vigorous sortie into the road; but it was only to find the enemy in full retreat, and a few dropping shots at long range ended the skirmish.
"I say, Vance," exclaimed Diggory, "who are they?
Who are these fellows ?" Now, as the aforesaid Philistines play rather an Important part in the opening chapters of our story, I propose to answer the question myself, in such a way that the reader may be enabled to take a more intelligent interest in the chain of events which commenced with the destruction of the snow man; and in order that this may be done in a satisfactory manner, I will in a few words map out the ground on which this memorable campaign was afterwards conducted.
Take the well-known drawing of two right angles In Euclid's definition, and imagine the horizontal line to be the main road to Chatford, while the perpendicular one standing on it is a by-way called Locker's lane.
In the right angle stood The Birches; the house itself faced the Chatford road, while behind it, in regular succession, came first the sloping garden, then the walled-in playground, and then the small field in which were attempted such games of cricket and football as the limited number of pupils would permit.

There were three doors in the playground--one the entrance from the garden, another opening into the lane, and a third into the field, the two latter being usually kept locked.
Locker's Lane was a short cut to Chatford, yet Rule 21 in The Birches Statute-Book ordained that no boy should either go or return by this route when visiting the town; the whole road was practically put out of bounds, and the reason for this regulation was as follows: At the corner of the playing field the lane took a sharp turn, and about a quarter of a mile beyond this stood a large red-brick house, shut in on three sides by a high wall, whereon, close to the heavy double doors which formed the entrance, appeared a board bearing in big letters the legend-- HORACE HOUSE, Middle-Class School for Boys.
A.PHILLIPS, B.A., Head-master.
The pupils of Mr.Phillips had been formerly called by Mr.Welsby's boys the Phillipians, which title had in time given place to the present nickname of the Philistines.
I have no doubt that the average boy turned out by Horace House was as good a fellow, taking him all round, as the average boy produced by The Birches; and that, if they had been thrown together in one school, they would, for the most part, have made very good friends and comrades.
However, in fairness both to them and to their rivals, it must be said that at the period of our story Mr.Phillips seemed for some time past to have been unusually unfortunate in his elder boys: they were undoubtedly "cads," and the character of the whole establishment, as far as the scholars were concerned, naturally yielded to the influence of its leaders.
It had been customary every term for the Birchites to play a match against them either at cricket or football; but their conduct during a visit paid to the ground of the latter, back in the previous summer, had been so very ungentlemanly and unsportsmanlike that, when the next challenge arrived for an encounter at football, Mr.Welsby wrote back a polite note expressing regret that he did not see his way clear to permit a continuation of the matches.