war help

i just started playing maybe 3 weeks ago and took part of my first clan war today and was massively disappointed. i typically do great in multiplayer attacks (2-3 stars unless im being optimistic with my attack) so im not sure why suddenly i could only 18% my first attack and 1 star my second.

i thought i had a good strategy for my first attack but my army was wiped pretty quickly. the first attack sucked so much i decided to just do a cookie army for the second after watching replays of people doing the same and had a somewhat better result