In the battle between Avshalom's army and David's forces Avshalom is riding a donkey which runs away when Avshalom is caught by his hair in a tree.
וַיִּקָּרֵא אַבְשָׁלוֹם לִפְנֵי עַבְדֵי דָוִד וְאַבְשָׁלוֹם רֹכֵב עַל־הַפֶּרֶד וַיָּבֹא הַפֶּרֶד תַּחַת שׂוֹבֶךְ הָאֵלָה הַגְּדוֹלָה וַיֶּחֱזַק רֹאשׁוֹ בָאֵלָה וַיֻּתַּן בֵּין הַשָּׁמַיִם וּבֵין הָאָרֶץ וְהַפֶּרֶד אֲשֶׁר־תַּחְתָּיו עָבָר׃
Absalom encountered some of David’s followers. Absalom was riding on a mule, and as the mule passed under the tangled branches of a great terebinth, his hair got caught in the terebinth; he was held between heaven and earth as the mule under him kept going. (2 Shmuel 18:9)
Yet we know that Avshalom had a chariot
וַיְהִי מֵאַחֲרֵי כֵן וַיַּעַשׂ לוֹ אַבְשָׁלוֹם מֶרְכָּבָה וְסֻסִים וַחֲמִשִּׁים אִישׁ רָצִים לְפָנָיו׃
Sometime afterward, Absalom provided himself with a chariot, horses, and fifty outrunners. (ibid 15:1)
A chariot would seem to be a better transport for a (would-be) king during a battle, rather than a mule. Why then did Avshalom opt to ride a donkey into battle instead of a chariot?
Please provide answers that are either based in the text and/or sourced rather than personal speculation (eg he knew a donkey would be better for a battle in the forest 18:6 precludes that)