Aries is the sign of the warrior, and the house that has Aries on the cusp (beginning of it) can show where your inner warrior can come out.
If you have 2 house cusps with Aries on it, you can be a super warrior, and if you have no house cusps with Aries on them, this means Aries is intercepted (contained within) the house cusp that has Pisces on it, so read for that house. Intercepted Aries can show you hide your inner warrior more than most, and have to work a little harder or overcome a block in order to access it.
Note that if you use Whole Sign or Equal house systems, there are no interceptions or duplicate signs, so it'll just be one house.
House Cusps in Aries
Aries on the 1st house cusp: The 1st house is naturally ruled by Aries, so you can be at home with your warrior energy to a degree. The 1st house is the house of the self and rules how you come across, so people may view you as a natural warrior (unless your Mars is afflicted, intercepted, or in the 12th house).
Aries on the 2nd house cusp: The 2nd house is the house of money and values, so you may be a financial warrior (so you take the lead when it comes to money), or a warrior with your values and beliefs (leading the way for others).
Aries on the 3rd house cusp: The 3rd house rules communication, so you can be a warrior of words, someone who can defend their ideas and opinions. Your method of communicating may be more forceful, strong, and you may be more open (unless you have Mercury retrograde, in the 12th house, or intercepted).
Aries on the 4th house cusp: The 4th house rules your home, family, and emotions, so you may be a warrior for your home and family. You can defend the people you view as family steadfastly, and you can fight for your home. You can also be forceful with your emotions (unless the Moon is intercepted or in the 12th house).
Aries on the 5th house cusp: The 5th house rules your hobbies, creativity, and love, so you can be a heart-centric warrior. You can be forceful and strong with your creativity, and pursue your hobbies with zeal and spunk. You can be more take-charge in love, and go for what you want.
Aries on the 6th house cusp: The 6th house rules work, health, and daily life, so you can be take-charge with your work life, pushing to do work you're passionate about, and defending the work you do with gusto. You can be dynamic in your routine and lifestyle, and want to be more active with your health.
Aries on the 7th house cusp: The 7th house rules relationships and the people in your life, so you can be a warrior for others, defending those you care about or who can't defend themselves, and you can be more take-charge in your relationships.
Aries on the 8th house cusp: The 8th house has alternate warrior energy, a little more on the darker side than Aries, but still strong, so your warrior energy can seem more natural to you, but you may channel it into deeper issues, complex situations, and total transformations.
Aries on the 9th house cusp: The 9th house rules travel, expansion, and beliefs, so you can be a warrior for exploration, expansion, and new experiences. You may be passionate about seeing the world, and you can take the bull by the horns more easily than most. You can also be a warrior for your beliefs and defend them.
Aries on the 10th house cusp: The 10th house rules your career and life path, so you can be a warrior with your career, taking charge and pushing hard for your goals and ambitions. You can work on being clear about where you're going and what you want, and may strive to have the persona of a warrior.
Aries on the 11th house cusp: The 11th house rules your friends, groups, causes, and dreams, so you can be a warrior for the causes you're passionate about, a real humanitarian and charitable person. You can be a leader of groups, a defender of friends, and forcefully pursue your dreams.
Aries on the 12th house cusp: The 12th house likes to hide energy, so your inner warrior may not be shown openly to anyone new or in situations where you're uncomfortable. Your warrior can come out when you're comfortable and confident, and you may be a better fighter in the background or shadows, where you can be unseen.
Suggested Reading: Pisces Houses: Where You Trust Your Gut