What's going on?

Tuesday,
  "Gotcha!" I said as I pounced on a rabbit. I scraped earth on my catch and sniffed the air. "Smell anything?" asked Icefur. I turned around to see Icefur and Flamestrike. We were all hunting on a nice, sunny day. I sniffed the air again and looked at Icefur and Flamestrike. "I smell ShadowClan!" I said. They both sniffed the air and we all darted in the direction of the scent. As we ran, Flamestrike stopped us in our tracks, and ran in a different direction. Icefur and I ran after him. There we saw Stumpytail  and Cinderfur. "What are you doing in our territory?!?" hissed Flamestrike. "What do you think you are doing, going around and breaking the warrior code?" said Icefur. We hissed for them to leave. "You have no business here in WindClan!" I snapped. The ShadowClan cats hissed at us. Then, we starting chasing Stumpytail and Cinderfur out of our territory. We chased them to Fourtrees. Stumpytail ran along back towards ShadowClan and as Cinderfur followed him, he shouted "We'll be back! And soon!" And off the ShadowClan warriors went. Icefur, Flamestrike, and I ran back to camp. The three of us went to talk to Tallstar. We found him near the fresh kill, reminding me of the rabbit I caught. "Tallstar! We found ShadowClan in our territory." said Icefur. "Where?" asked Tallstar. "Heading towards Fourtrees." said Flamestrike. "Where are they now?" Tallstar asked. "We chased them out of WindClan and Cinderfur said they would be back soon."  I replied. "How many cats were there?" Tallstar said. "Two, Cinderfur and Stumpytail." meowed Flamestrike. "Thank you for the information, now. We'll need to double patrols now," said Tallstar. "We don't need anymore chaos now."  We all worriedly smiled. Then, we went back to collect our prey and got ready for the next patrol. What were the ShadowClan cats doing in our territory? And what are they coming back for?
~HF