Unexpected Magic by Diana Wynne Jones

Enna Hittims. “Right. To the kitchen!” She held her sword up and led the other two at a run around the open kitchen door.
    Something in the kitchen went ching- BOING ! and there was the glop-glop-glop of liquid running out of a bottle. “Oh, no!” said Anne. She had left the milk bottle on the floor while she was looking for Tibby. Worse still, she remembered the way Tibby always knew when there was milk on the floor. She could not let Tibby get in the way of the enchanted sword. She ran across the hall.
    â€œMy new dress is soaked!” she heard Marlene whine. Then came the sound of Tibby’s cat flap opening. Marlene gasped, “A monster!”
    â€œWhat a splendid one!” Enna Hittims cried ringingly. “You two guard my rear while I kill it.”
    By the time Anne got to the kitchen, Enna Hittims was standing in a warlike attitude facing Tibby, barring Tibby’s way to the pool of milk on the floor. And Tibby, who had no kind of idea about enchanted swords, was crouching with her tail swishing, staring eagerly at Enna Hittims. It was clear she thought the hero was a new kind of mouse.
    Anne charged through the kitchen and caught Tibby just as she sprang. “Oh-ho!” shouted Enna Hittims. The enchanted sword swung at Anne’s right foot. Spike sprang at Anne’s left foot and stabbed. Tibby struggled and clawed. But Anne hung on to Tibby in spite of it all. She ran out into the hall, kicking the kitchen door shut behind her, and did not let go of Tibby until the door was shut. Then she dropped Tibby. Tibby stood in a ruffled hump, giving Anne the look that meant they would not be on speaking terms for some time, and then stalked away upstairs.
    Anne sat on the bottom stair, watching blood ooze from a round hole in her left big toe and more blood trickle from a deep cut under her right ankle. “How lucky I didn’t invent them poisoned weapons!” she said. She sat and thought. Surely one ordinary-sized girl ought to be able to defeat three inch-high heroes, if she went about it the right way. She needed armor really.
    She went thoughtfully up to her bedroom. Tibby was now crouched on Anne’s bed, delicately picking pieces of macaroni cheese out of the stewed apple. Tibby loved cheese. She looked up at Anne with the look that meant “Stop me if you dare!”
    â€œYou eat it,” said Anne. “Be my guest. Stuff yourself. It’ll keep you up here out of danger.” She got dressed. She put on her toughest jeans and her hard shoes and her thickest sweater and then the zip-up plastic jacket to make quite sure. She tied the covers of her drawing book around her legs to make even more sure. Then she collected a handful of shoelaces, string, and belts and picked up the tray. It had little regular notches in it where Enna Hittims had carved her footholds. Mrs. Harvey would not be pleased.
    She shut her bedroom door to keep Tibby in there and went down to the living room. She stepped over the pieces of the china lamp to the dining area and fetched out the tea trolley. Then she spent quite a long time tying the tray to the front of the trolley, testing it, and tying it again. When she had it tied firmly, so that it grated along the carpet as the trolley was pushed, and nothing an inch high could possibly get under the bottom edge of the tray, Anne picked up the poker. She was ready.
    She wheeled the armored trolley out through the hall. By lying on her stomach across the top of it, she managed to reach the handle of the kitchen door and open it quietly. She looked warily inside.
    She was in luck. The three heroes thought they had defeated her. They were relaxing, filling their waterskins at the edge of the pool of milk. “Now remember to go for the big giants’ eyes,” Enna Hittims was saying. “You can hold on to their ears if they have short hair.”
    â€œNo, you can’t!” Anne shouted. She shoved off with one foot and