US/OIl buy

After ending diagonal, price rapidly rose which gave me an initial idea that bulls are taking over. Then I waited for recognizable corrective pattern, and eventually flat pattern developed. And it could've been ending somewhere around .618 fibo level of the previous impulsive move to the upside. After seeing all of this, I only needed to see bullish momentum to open a position. At last, that bullish momentum showed up with an engulfing candle on 4h timeframe.